Add support for PR and Issue templates to QMK_firmware GitHub (#4494)

* 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

* Minor tweaks

* More minor tweaks

* Spleeling fix

Co-Authored-By: drashna <drashna@live.com>

* CapiTALization fIXes

Co-Authored-By: drashna <drashna@live.com>

* Use new issue URL

Co-Authored-By: drashna <drashna@live.com>

* Add blanck issue template

* Update the PR template

* Formatting and additional changes

* Update docs/support.md

Co-Authored-By: drashna <drashna@live.com>

.github/ISSUE_TEMPLATE/blank.md

@@ -0,0 +1,5 @@
+---
+name: Blank issue
+about: If you're 100% sure that you don't need one of the other issue templates, use this one instead. 
+
+---