Create pull_request_template.md (#65)

Adding a pull request template to the repo.

.github/pull_request_template.md

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+## Description
+<!-- Provide a brief description of the changes in this PR -->
+
+## Related Issue
+<!-- Link to the issue that this PR addresses, if applicable -->
+
+## Changes Made
+<!-- List the key changes made in this PR -->
+
+- 
+- 
+- 
+
+## Testing
+<!-- Describe how these changes were tested -->
+
+## Checklist
+<!-- Mark the items you've completed with an [x] -->
+
+- [ ] I have read the [contributing](https://github.com/dotimplement/HealthChain/CONTRIBUTING.md) guidelines
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+
+## Additional Notes
+<!-- Add any other context about the PR here -->
+