chore: add GitHub pull request template with CLA reference

- Add PR template with standardized sections for contributions
- Include CLA acknowledgment checkbox in PR checklist
- Add type of change and related issues sections

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- Describe your changes -->
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] Code refactoring
+
+## Checklist
+- [ ] I have read and agree to the [CLA](./CLA.md)
+- [ ] My code follows the project's style guidelines
+- [ ] I have tested my changes
+- [ ] I have updated the documentation
+
+## Related Issues
+Closes #(issue number)

.github/workflows/cla.yml

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+name: "Obsidian Task Genius CLA Assistant"
+on:
+    issue_comment:
+        types: [created]
+    pull_request_target:
+        types: [opened, closed, synchronize]
+
+jobs:
+    CLAssistant:
+        runs-on: ubuntu-latest
+        steps:
+            - name: "CLA Assistant"
+              if: (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
+              uses: contributor-assistant/github-action@v2.3.0
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+                  PERSONAL_ACCESS_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+              with:
+                  path-to-signatures: "signatures/cla.json"
+                  path-to-document: "https://github.com/quorafind/obsidian-task-genius/blob/master/CLA.md"
+                  branch: "main"
+                  allowlist: bot*