DGS-19008: Add PR template (#197)

Author: GunalKupta

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,45 @@
+Please prefix all TypeScript pull-requests with `[Typescript]`
+
+<!--
+Suggested PR template: Fill/delete/add sections as needed. Optionally delete any commented block.
+-->
+What
+----
+<!--
+Briefly describe **what** you have changed and **why**.
+Optionally include implementation strategy.
+-->
+
+Checklist
+------------------
+- [ ] Contains customer facing changes? Including API/behavior changes <!-- This can help identify if it has introduced any breaking changes -->
+- [ ] Did you add sufficient unit test and/or integration test coverage for this PR?
+  - If not, please explain why it is not required
+
+References
+----------
+JIRA:
+<!--
+Copy&paste links: to Jira ticket, other PRs, issues, Slack conversations...
+For code bumps: link to PR, tag or GitHub `/compare/master...master`
+-->
+
+Test & Review
+------------
+<!--
+Has it been tested? how?
+Copy&paste any handy instructions, steps or requirements that can save time to the reviewer or any reader.
+-->
+
+Open questions / Follow-ups
+--------------------------
+<!--
+Optional: anything open to discussion for the reviewer, out of scope, or follow-ups.
+-->
+
+<!--
+Review stakeholders
+------------------
+<!--
+Optional: mention stakeholders or if special context that is required to review.
+-->