CONT-990_Adding PR template

Author: malikparvez

.github/pull_request_template.md

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+## Summary
+Provide a detailed description of all the changes present in this pull request.
+
+## Additional Context
+Add any additional context about the problem here. 
+- [ ] Root cause and the steps to reproduce. (If applicable)
+- [ ] Thought process behind the implementation.
+
+## Related Issues (if any)
+Mention any related issues or pull requests.
+
+## Checklist
+- [ ] 🟢 Spec tests.
+- [ ] 🟢 Acceptance tests.
+- [ ] Manually verified. (For example `puppet apply`)