Added PULL_REQUEST_TEMPLATE.md for Research Assistant

Author: UtkarshMishra-Microsoft

ResearchAssistant/PULL_REQUEST_TEMPLATE.md

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+## Motivation and Context
+<!-- Describe the purpose of the changes being proposed for the Research Assistant module. What problem does it solve or functionality does it add? -->
+* ...
+
+## Description
+<!-- Provide a detailed description of the changes. Include any relevant information, such as design decisions, architectural considerations, and dependencies specific to Research Assistant. -->
+* ...
+
+## Contribution Checklist
+- [ ] I have built and tested the Research Assistant module locally and in a deployed environment.
+- [ ] I have pulled the latest code from the main branch, built the frontend for Research Assistant, and committed all necessary files.
+- [ ] I have ensured that this change is applicable to all Research Assistant users and does not include organization-specific code or assets.
+- [ ] Existing functionality within the Research Assistant module remains unaffected.
+
+## Golden Path Verification
+- [ ] I have tested the primary workflows for Research Assistant (the "golden path") to ensure they function correctly without errors.
+
+## Documentation Updates
+<!-- Mark one with an "x" and provide details if applicable. -->
+- [ ] Updated README.md specific to the Research Assistant module.
+- [ ] Updated SolutionArchitecture.md for Research Assistant (if applicable).
+- [ ] Updated Troubleshooting.md for Research Assistant (if applicable).
+
+Details of documentation updates:
+* ...
+
+## Screenshots (If Applicable)
+* Provide before and after screenshots to illustrate the changes made in the Research Assistant module.
+
+## Related Issues
+<!-- List any related issues or tickets for the Research Assistant module. -->
+* Closes #...
+
+## Additional Information
+* Any other information that would be helpful for reviewers of the Research Assistant module.
+* ...