Draft issue and PR templates.

.github/ISSUE_TEMPLATE/bug_form.yaml

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+name: Bug Report Form
+description: Report a bug or a similiar issue.
+labels:
+  - needs:triage
+title: "Bug: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting an issue. Please fill out the below template with as much detail as possible. Incomplete bug reports are likely to be closed without comment.
+
+        If you want to suggest a feature use the
+        [Feature Request template](https://github.com/akaihola/darglint2/issues/new?template=feature_request.md)
+        instead.
+
+  - type: checkboxes
+    id: checklist-existing-issues
+    attributes:
+      label: Existing Issues
+      description: |
+        Please  do not create a new issue for a problem that was already reported but use the existing thread.
+        However issues that only exist in the original [darglint](https://github.com/terrencepreilly/darglint)
+        repository may be reported again in this one.
+        Please link all issues that might relate to this report below.
+      options:
+        - label: |
+            I have searched the [darglint2 issue tracker](https://github.com/akaihola/darglint2/issues?q=is%3Aissue)
+            for open and closed issues to avoid duplicates.
+          required: true
+        - label: |
+            I have searched the [darglint issue tracker](https://github.com/terrencepreilly/darglint/issues?q=is%3Aissue)
+            for open and closed issues.
+          required: false
+
+  - type: textarea
+    id: related-issues
+    attributes:
+      label: Related issues
+      description: Link all issues that might relate to this report.
+      placeholder: |
+        - #14
+        - terrencepreilly/darglint#78
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: |
+        Please describe your issue and its context in a clear and concise way.
+        Please create a minimal, reproducible example (MRE) that you have actually tested to work.
+        Please also use a minimal configuration and make sure that you don't overlook any config files in your working directory.
+        Here are some tips for providing a minimal example: https://stackoverflow.com/help/mcve
+        Please enclose the minimal example and the corresponding output.
+
+        Use code blocks with `py`, `pytb`, `dosini` or `toml` highlighting where applicable.
+      placeholder: |
+        I encountered a bug.
+
+        ```py
+        # minimal example (MRE)
+        ```
+
+        Steps to reproduce:
+        1. Save MRE to `somefile.py`
+        2. Run `darglint2 <options>` in bash
+        3. See error
+
+        ```
+        some output
+        ```
+
+        ```pytb
+        Error message
+        ```
+
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: Run `darglint2 --version` to find out.
+    validations:
+      required: true
+
+  - type: input
+    id: os
+    attributes:
+      label: OS
+      description: Operating system where useful (e.g. in case of OSErrors)
+      placeholder: <os> <version>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug or a similiar issue - the classic way
+title: ""
+labels: "needs: triage"
+assignees: ""
+---
+
+<!--
+Thank you for reporting an issue. Please fill out the below template with
+as much detail as possible. Incomplete bug reports are likely to be closed
+without comment.
+
+If you want to suggest a feature, please use our
+[Feature Request template](https://github.com/akaihola/darglint2/issues/new?template=feature_request.md)
+instead.
+-->
+
+#### Existing Issues
+
+<!--
+Please  do not create a new issue for a problem that was already reported but use the existing thread.
+However issues that only exist in the original [darglint](https://github.com/terrencepreilly/darglint)
+repository may be reported again in this one.
+Please link all issues that might relate to this report below.
+-->
+
+-   [ ] I have searched the [darglint2 issue tracker](https://github.com/akaihola/darglint2/issues?q=is%3Aissue) for open and closed issues to avoid duplicates.
+-   [ ] I have searched the [darglint issue tracker](https://github.com/terrencepreilly/darglint/issues?q=is%3Aissue) for open and closed issues. (optional)
+
+I have found the following related issues:
+
+<!-- E.g.:
+
+- #14
+- terrencepreilly/darglint#78
+
+-->
+
+#### Description
+
+<!-- Description
+Please describe your issue and its context in a clear and concise way.
+Please create a minimal, reproducible example (MRE) that you have actually tested to work.
+Please also use a minimal configuration and make sure that you don't overlook any config files in your working directory.
+Here are some tips for providing a minimal example: https://stackoverflow.com/help/mcve
+Please enclose the minimal example and the corresponding output.
+
+Use code blocks with `py`, `pytb`, `dosini` or `toml` highlighting where applicable.
+-->
+
+<!-- E.g.
+Steps to reproduce the behavior:
+1. Save MRE to `somefile`
+2. Run `some command` in bash
+3. See error
+-->
+
+#### Environment
+
+<!--
+Run `darglint2 --version`
+Provide the OS where useful (e.g. in case of OSErrors)
+-->
+
+-   Version:
+-   OS:

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Documentation
+    url: https://akaihola.github.io/darglint2/
+    about: Documentation on installing, using and contributing to Darglint2.
+
+  - name: Support
+    url: https://github.com/akaihola/darglint2/discussions/categories/faq
+    about: Please ask for support in the Discussions FAQ.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project.
+title: "FR: "
+labels: "type:enhancement"
+assignees: ""
+---
+
+#### The problem
+
+<!--
+Is your feature request related to a problem?
+Please provide a clear and concise description of what the problem is.
+Ex. I'm always frustrated when [...]
+ -->
+
+#### Requested Solution
+
+<!--
+A clear and concise description of what you want to happen.
+-->
+
+#### Alternatives
+
+<!--
+A clear and concise description of any alternative solutions or features you've considered.
+-->
+
+#### Additional context
+
+<!--
+Add any other context or screenshots about the feature request here.
+-->

.github/pull_request_template.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+### Description
+
+<!--- Describe your changes in detail -->
+
+### Related Issue
+
+<!---
+It is usually good practice to open an issue first before creating a PR.
+If suggesting a new feature or change, please discuss it in an issue first.
+If fixing a bug, there should be an issue describing it with steps to reproduce.
+However we won't turn your PR down just because such an issue is missing.
+Please link to the issue here. E.g.:
+
+Fixes #12
+
+-->
+
+### Motivation and Context
+
+<!--- Why is this change required? What problem does it solve? -->
+
+### How Has This Been Tested?
+
+<!---
+Please describe in detail how you tested your changes.
+Include details of your testing environment, and the tests you ran to
+see how your change affects other areas of the code, etc.
+-->
+
+### Screenshots (if appropriate):
+
+### Types of changes
+
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+
+-   [ ] Bug fix (non-breaking change which fixes an issue)
+-   [ ] New feature (non-breaking change which adds functionality)
+-   [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+### Checklist:
+
+<!---
+Go over all the following points, and put an `x` in all the boxes that apply.
+If you're unsure about any of these, don't hesitate to ask. We're here to help!
+-->
+
+-   [ ] I have read the [CONTRIBUTING]() guide.
+-   [ ] My code follows the [code style]() of this project.
+-   [ ] My change requires a change to the documentation.
+-   [ ] I have updated the documentation accordingly.
+-   [ ] I have added tests to cover my changes.
+-   [ ] All new and existing tests passed.
+
+_I provide my contribution under the terms of the [license](./../../LICENSE.txt) of this repository and I affirm the [Developer Certificate of Origin][dco]._
+
+[dco]: https://developercertificate.org/
+
+<!--
+This template is sourced from the awesome https://github.com/TalAter/open-source-templates
+-->