Create pull_request_template.md (#3)

Creating pull request template

Author: dangitschris

.github/pull_request_template.md

@@ -0,0 +1,7 @@
+## Changes
+
+<!-- Describe *what* you are changing in this PR. -->
+
+## Motivation
+
+<!-- Describe *why* you are making these changes and link to any related JIRA tickets [KK-XXXX] -->