CB-11921 - Add github pull request template

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,22 @@
+<!--
+Please make sure the checklist boxes are all checked before submitting the PR. The checklist
+is intended as a quick reference, for complete details please see our Contributor Guidelines:
+
+http://cordova.apache.org/contribute/contribute_guidelines.html
+
+Thanks!
+-->
+
+### Platforms affected
+
+
+### What does this PR do?
+
+
+### What testing has been done on this change?
+
+
+### Checklist
+- [ ] [Reported an issue](http://cordova.apache.org/contribute/issues.html) in the JIRA database
+- [ ] Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
+- [ ] Added automated test coverage as appropriate for this change.