feat: Add initial pull request template. (#48)

Author: ShantKhatri

.github/pull_request_template.md

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+## Summary
+
+<!-- One paragraph explaining what this PR does and why. Link the related issue below. -->
+
+Closes #
+
+---
+
+## Type of Change
+
+<!-- Check all that apply -->
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Refactor (no functional change)
+- [ ] UI / Design change
+- [ ] Tests only
+- [ ] Documentation
+- [ ] Infrastructure / DevOps
+- [ ] Security
+
+---
+
+## What Changed
+
+<!-- Bullet list of the key changes made. Be specific about files touched and why. -->
+
+-
+-
+-
+
+---
+
+## How to Test
+
+<!-- Steps to reproduce or verify the change. Include commands, test data, or scenarios. -->
+
+1.
+2.
+3.
+
+---
+
+## Checklist
+
+- [ ] My code follows the project's coding style (`pnpm -r run lint` passes).
+- [ ] TypeScript compiles without errors (`pnpm -r run typecheck`).
+- [ ] I have added or updated tests for the changes I made.
+- [ ] All tests pass locally (`pnpm -r run test`).
+- [ ] I have updated documentation where necessary.
+- [ ] No new `console.log` or debug statements left in the code.
+- [ ] Breaking changes are documented in this PR description.
+
+---
+
+## Screenshots / Recordings
+
+<!-- For UI changes, attach before/after screenshots or a short screen recording. Delete this section if not applicable. -->
+
+---
+
+## Additional Context
+
+<!-- Anything else reviewers should know — trade-offs, future work, known limitations. -->