Added PR templates for Backend, Frontend, and Documentation

.github/PULL_REQUEST_TEMPLATE/documentation.md

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+### Documentation Update - Pull Request Template
+
+#### Description
+- **Summary of Documentation Updates:** Briefly describe the purpose of the documentation changes, including context or background as necessary.
+
+#### Documented Areas
+- **Documents Added or Updated:** List specific files or sections updated in this PR (e.g., API documentation, AI model instructions, setup guides).
+- **Key Changes or Additions:** Highlight any new sections, figures, or tables added, or notable updates made.
+
+#### Related Issues or Tasks
+- Closes #<issue_number> (Link to relevant documentation issue or task)
+
+#### Checklist
+- [ ] Follows the style guide for documentation
+- [ ] Content is clear, concise, and accurate
+- [ ] New diagrams, images, or tables are appropriately referenced and included
+- [ ] This PR is ready for review by the documentation team
+
+#### Additional Notes
+- Add any further comments, questions, or future documentation plans here.
+