docs: create template contribution guide

[codevalve]

Template Contribution Guide

Description

Create comprehensive documentation for community template contributions.

Documentation Sections

• Template structure guide
• Required files and their purpose
• Testing requirements
• Best practices and standards
• Submission process

Technical Details

1. Template validation system
2. Testing requirements
3. Documentation standards
4. Example template structure

Additional Tasks

• Create template development command
• Add template showcase in docs
• Set up template validation in CI

Success Criteria

• Clear contribution process
• Template validation works
• Documentation is comprehensive
• Easy for contributors to get started