Added pull request template

pull_request_template.md

@@ -0,0 +1,8 @@
+## Checklist before pull request
+* [ ] There is an associated issue that is labelled 'Bug' or 'help wanted' or is in the Community milestone
+* [ ] Code is up-to-date with the `master` branch
+* [ ] You've successfully run `npm test` locally
+* [ ] There are new or updated tests validating the change
+
+## Fixes #
+About your changes