Create pull_request_template.md (#4518)

* Create pull_request_template.md

docs/pull_request_template.md

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+## Link to pivotal/JIRA issue
+    -
+## What was done?
+    - Explain the implementation goals being solved or the feature with the reviewer in mind
+    - Mention any relevant issues or insights to be shared with the reviewer.
+    - Alternatives considered
+## How to test?
+    - Describe the testing approach taken to verify the changes, including:
+        - Unit/integration/manual tests
+        - Test data used
+    - Specify any relevant testing environments used (e.g., development, staging, demo, Heroku).
+    - Risk Assessment
+        - Risks or side effects associated with the changes and how they were mitigated.
+        - Highlight areas that may need extra attention during code review or testing.
+        - Paste SQL queries or output where relevant
+## Screenshots (for visual change)
+    - Before | After 
+