feat: add document templates library with 10 templates

src/templates/technical-spec.md

@@ -0,0 +1,42 @@
+# Technical Specification: [Feature Name]
+
+**Version:** 1.0
+**Date:** {{DATE}}
+**Author:** Your Name
+**Status:** Draft
+
+## Overview
+
+Brief description of what this feature does.
+
+## Requirements
+
+### Functional Requirements
+1. Requirement 1
+2. Requirement 2
+
+### Non-Functional Requirements
+1. Performance requirement
+2. Security requirement
+
+## Architecture
+
+Describe the technical approach.
+
+## API Design
+
+### Endpoints
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | /api/resource | Get resource |
+
+## Testing Strategy
+
+Describe how this will be tested.
+
+## Timeline
+
+| Phase | Duration | Deliverables |
+|-------|----------|-------------|
+| Phase 1 | 1 week | Core implementation |