Added PR & issue templates

To help with the maintenance of the project

.github/issue_template.md

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+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+1.
+1.
+1.
+
+## Specifications
+
+- Version:
+- Platform:
+- Subsystem:
+
+## Anything else that you think is relevant

.github/pull_request_template.md

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+## Description of your pull request
+
+**Replace this placeholder text with a summary of the changes in your PR.
+The more detailed you are, the better.**
+
+## Why should it be considered?
+
+Please explain why you think that this change should be considered.
+
+Why am I asking this?
+
+If it's a new feature, I will be left to maintain it after it gets
+merged in to the project. So I'm keen to know why I'll be taking on
+the future maintenance of it.
+
+## Pull request checklist
+
+Before submitting the PR make sure the following things have been done
+(and denote this by checking the relevant checkboxes):
+
+- [ ] The code is consistent with [Clojure style guide](https://github.com/bbatsov/clojure-style-guide#the-clojure-style-guide).
+- [ ] All code passes the linter (`clj-kondo --lint src`).
+- [ ] You've added tests (if possible) to cover your change(s).
+- [ ] All tests are passing.
+- [ ] The commits are consistent with [the Git commit style guide](https://chris.beams.io/posts/git-commit/).
+- [ ] You've updated the [changelog](../blob/master/CHANGELOG.md) (if adding/changing user-visible functionality).
+
+
+Thanks!