Merge pull request #146 from stbenjam/pr-template

Add PR template to remind contributors to run make mapping

.github/pull_request_template.md

@@ -0,0 +1,13 @@
+<!--
+
+Thanks for contributing to ci-test-mapping.
+
+Please make sure to run `make mapping` and commit the results when
+making changes to test ownership. To have your PR's tested
+automatically, join the openshift-eng GitHub organization. See the
+instructions on #forum-pge-cloud-ops on Slack.
+
+Please see README.md for additional information how about
+this repo works.
+
+-->