workflow: add issue pull request template

Author: ulivz

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+<!-- Please don't delete this template or we'll close your issue -->
+<!-- Before creating an issue please make sure you are using the latest version of VuePress. -->
+
+<!-- Please confirm you will submit an issue. -->
+<!-- Issues which contain questions or support requests will be closed. -->
+<!-- (Update "[ ]" to "[x]" to check a box) -->
+
+- [ ] I confirm that this is an issue rather than a question.
+
+<!-- Please ask questions via following several ways. -->
+<!-- https://vue-land.js.org/ -->
+<!-- https://forum.vuejs.org/ -->
+<!-- https://stackoverflow.com/questions/ask?tags=vuepress -->
+
+## Bug report
+
+#### Steps to reproduce
+
+<!-- Please choose one of the following and and fill in the information. -->
+<!-- (Update "[ ]" to "[x]" to check a box) -->
+
+<!-- If you are reporting a bug that can ONLY be reproduced on your repository, PLEASE provide this repo link. That takes guessing work out of the way and saves us time. -->
+<!-- If your repo isn't public, you can use `codesandbox` or `yarn create vuepress` to create a minimal reproduction -->
+
+- [ ] I prepared a reproduction repo, here is the reproduction repo: 
+
+- [ ] This issue doesn't need a reproduction repro, here is the steps to reproduce
+
+#### What is expected?
+
+#### What is actually happening?
+
+#### Other relevant information
+
+- `npx vuepress info`:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+<!-- Please don't delete this template or we'll close your issue -->
+<!-- Before creating an issue please make sure you are using the latest version of VuePress. -->
+
+## Feature request
+
+<!-- Please ask questions on StackOverflow. -->
+<!-- https://stackoverflow.com/questions/ask?tags=vuepress -->
+<!-- Issues which contain questions or support requests will be closed. -->
+
+#### What problem does this feature solve?
+
+#### What does the proposed API look like?
+
+#### How should this be implemented in your opinion?
+
+#### Are you willing to work on this yourself?

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please don't delete this template -->
+
+<!-- PULL REQUEST TEMPLATE -->
+<!-- (Update "[ ]" to "[x]" to check a box) -->
+
+**Summary**
+
+**What kind of change does this PR introduce?** (check at least one)
+
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Code style update
+- [ ] Refactor
+- [ ] Docs
+- [ ] Build-related changes
+- [ ] Other, please describe:
+
+If changing the UI of default theme, please provide the **before/after** screenshot:
+
+**Does this PR introduce a breaking change?** (check one)
+
+- [ ] Yes
+- [ ] No
+
+If yes, please describe the impact and migration path for existing applications:
+
+**The PR fulfills these requirements:**
+
+- [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. `fix #xxx[,#xxx]`, where "xxx" is the issue number)
+
+You have tested in the following browsers: (Providing a detailed version will be better.)
+
+- [ ] Chrome
+- [ ] Firefox
+- [ ] Safari
+- [ ] Edge
+- [ ] IE
+
+If adding a **new feature**, the PR's description includes:
+
+- [ ] A convincing reason for adding this feature
+- [ ] Related documents have been updated
+- [ ] Related tests have been updated
+
+To avoid wasting your time, it's best to open a **feature request issue** first and wait for approval before working on it.
+
+**Other information:**