Added Pull request template

Signed-off-by: Vara Bonthu <vara.bonthu@gmail.com>

.github/PULL_REQUEST_TEMPLATE.md

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+### 🛑 Important:
+Please open an issue to discuss significant work before you start. We appreciate your contributions and don't want your efforts to go to waste!
+
+For guidelines on how to contribute, please review the [CONTRIBUTING.md](CONTRIBUTING.md) document.
+
+## Purpose of this PR
+Provide a clear and concise description of the changes. Explain the motivation behind these changes and link to relevant issues or discussions.
+
+**Proposed changes:**
+- <Change 1>
+- <Change 2>
+- <Change 3>
+
+## Change Category
+Indicate the type of change by marking the applicable boxes:
+
+- [ ] Bugfix (non-breaking change which fixes an issue)
+- [ ] Feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that could affect existing functionality)
+- [ ] Documentation update
+
+### Rationale
+
+<!-- Provide reasoning for the changes if not already covered in the description above. -->
+
+
+## Checklist
+Before submitting your PR, please review the following:
+
+- [ ] I have conducted a self-review of my own code.
+- [ ] I have updated documentation accordingly.
+- [ ] I have added tests that prove my changes are effective or that my feature works.
+- [ ] Existing unit tests pass locally with my changes.
+
+### Additional Notes
+
+<!-- Include any additional notes or context that could be helpful for the reviewers here. -->
+