Add PR template (#8)

.github/pull_request_template.md

@@ -0,0 +1,20 @@
+## Description
+<!--
+Describe the pull request and what it does
+1. What is this implementing
+2. How is it being implemented
+3. Why is this being implemented
+-->
+
+## Checks
+- [] No errors when running the tests
+- [] Build and checkstyle passes
+- [] Run the app and ran 2 commands without failing
+- [] Written the baseline test cases for the PR
+
+## Changelog
+- []
+- []
+- []
+
+## Comments for Reviewer (if any)