feat(skill): add make-repo-contribution skill

Adds a new skill to help AI agents follow repository contribution guidelines
when creating issues, commits, branches, and pull requests.

Includes:
- SKILL.md with comprehensive instructions
- Issue template for when none exists in repo
- PR template for when none exists in repo

skills/make-repo-contribution/assets/issue-template.md

@@ -0,0 +1,37 @@
+# <!-- Provide a concise, descriptive title for the issue -->
+
+## Summary
+
+<!-- Provide a clear, one-sentence description of the request or issue. -->
+
+## Context
+
+<!-- Explain why this change is needed. Include:
+- The problem being solved
+- Any relevant background information
+- Link to related issues or discussions if applicable
+-->
+
+## Proposed Solution
+
+<!-- Describe the suggested approach. Include:
+- Specific changes to be made
+- Files or areas affected
+- Any alternatives considered
+-->
+
+## Acceptance Criteria
+
+<!-- List measurable criteria for completion:
+- [ ] Criterion 1
+- [ ] Criterion 2
+-->
+
+## Additional Information
+
+<!-- Include any of the following if relevant:
+- Error messages or logs
+- Steps to reproduce (for bugs)
+- Dependencies or blockers
+- Impact assessment
+-->