added pr template

.github/pull_request_template.md

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+### Description
+A clear and concise description of what the PR does.
+- This PR does the following:
+  - Adds ...
+  - Fixes ...
+  - Updates ...
+
+### Related Issues
+Link any related issues using the format `Fixes #issue_number`. 
+This helps to automatically close related issues when the PR is merged.
+- Placeholder: "Fixes #123"
+
+### Changes
+List the detailed changes made in this PR.
+- Added a new feature to ...
+- Refactored the ...
+- Fixed a bug in ...
+
+### Testing Instructions
+Detailed instructions on how to test the changes. Include any setup needed and specific test cases.
+1. Pull this branch.
+2. Run `npm install` to install dependencies.
+3. Run `npm test` to execute the test suite.
+4. Verify that ...
+
+### Screenshots (if applicable)
+Add any screenshots that help explain or visualize the changes.
+
+### Additional Context
+Any additional context or information that reviewers should be aware of.
+- This PR is based on the following...
+
+### Checklist
+Make sure to check off all the items before submitting. Mark with [x] if done.
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] My changes generate no new warnings
+- [ ] I am working on this issue under GSSOC