Add support for PR and Issue templates to QMK_firmware GitHub (#4491)

* Add support document

* Add Bug Report

* Add GitHub Pull Request Template

* Feature request issue template

* Touch up feature request template

* Add 'other issues' template

* move support doc

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,22 @@
+## Code Change Type
+- [ ] Core
+- [ ] Feature
+- [ ] Bugfix
+- [ ] Keyboard
+- [ ] Keymap/Layout/Userspace
+- [ ] Enhancement/Optimization
+- [ ] Documentation
+
+## Description
+A few sentences describing the overall goals of the pull request's commits.
+
+## Todo
+- [ ] Tests
+- [ ] Documentation
+
+## Issues Fixed or Closed by this PR
+
+* 
+
+## Long Description
+If needed, a longer description and a list of changes should be added here to make it clear what exactly this PR's goals are.