docs: Add GitHub issue and PR templates

.github/pull_request_template.md

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+## Description
+Brief summary of what this PR does.
+
+## Type of Change
+- [ ] New example or template
+- [ ] Documentation improvement
+- [ ] Bug fix
+- [ ] Feature guide
+- [ ] Other (please describe)
+
+## Related Issues
+Closes #(issue number)
+
+## Changes Made
+- Change 1
+- Change 2
+- Change 3
+
+## What to Review
+What should reviewers focus on?
+
+## Files Changed
+- `path/to/file1.md`
+- `path/to/file2.md`
+
+## Testing
+How have you tested this?
+- [ ] Tested locally with Claude Code
+- [ ] Verified examples work
+- [ ] Checked links and references
+- [ ] Reviewed for typos and clarity
+
+## Checklist
+- [ ] Follows project structure and conventions
+- [ ] Includes clear documentation/examples
+- [ ] Code/examples are copy-paste ready
+- [ ] All links are verified and working
+- [ ] No sensitive information included (keys, tokens, credentials)
+- [ ] Updated relevant README files
+- [ ] Commit message follows conventional commit format
+- [ ] No large files (>1MB) added
+
+## Screenshots or Examples
+If applicable, show what this adds:
+```
+[Example code or before/after comparison]
+```
+
+## Breaking Changes
+Does this change any existing content or behavior?
+- [ ] No breaking changes
+- [ ] Yes, and it's documented below
+
+If yes, please describe:
+
+## Additional Notes
+Any other information for reviewers?