chore(github): adds PR template (#218)

.github/pull_request_template.md

@@ -0,0 +1,24 @@
+### Description
+
+_A few sentences describing the overall effects and goals of the pull request's commits.
+What is the current behavior, and what is the updated/expected behavior with this PR?_
+
+### Other changes
+
+_Describe any minor or "drive-by" changes here._
+
+### Tested
+
+_An explanation of how the changes were tested or an explanation as to why they don't need to be._
+
+### Related issues
+
+- Fixes #[issue number here]
+
+### Backwards compatibility
+
+_Brief explanation of why these changes are/are not backwards compatible._
+
+### Documentation
+
+_The set of community facing docs that have been added/modified because of this change_