Add the initial GitHub pull request template

Author: Rynaard Burger

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,7 @@
+## What does it do?
+
+## Checklist before requesting a review
+
+- [ ] Run `bundle exec rubocop` to test for code style violations and recommendations
+- [ ] Add Unit Tests (aka `specs/*_spec.rb`) if applicable
+- [ ] Run `bundle exec rspec` to run the whole test suite and ensure all your tests pass