feat: add document templates library with 10 templates

src/templates/comparison.md

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+# Comparison: [Option A] vs [Option B]
+
+**Date:** {{DATE}}
+**Author:** Your Name
+
+## Overview
+
+Brief description of what is being compared and why.
+
+## Feature Comparison
+
+| Feature | Option A | Option B |
+|---------|----------|----------|
+| Feature 1 | Yes | Yes |
+| Feature 2 | Yes | No |
+| Feature 3 | No | Yes |
+| Feature 4 | Partial | Yes |
+
+## Pricing
+
+| Plan | Option A | Option B |
+|------|----------|----------|
+| Free | Limited | Limited |
+| Pro | $10/mo | $15/mo |
+| Enterprise | Custom | Custom |
+
+## Pros and Cons
+
+### Option A
+
+**Pros:**
+- Pro 1
+- Pro 2
+
+**Cons:**
+- Con 1
+- Con 2
+
+### Option B
+
+**Pros:**
+- Pro 1
+- Pro 2
+
+**Cons:**
+- Con 1
+- Con 2
+
+## Performance
+
+| Metric | Option A | Option B |
+|--------|----------|----------|
+| Speed | Fast | Moderate |
+| Memory | Low | Medium |
+| Scalability | Good | Excellent |
+
+## Recommendation
+
+Based on the analysis above, [Option A/B] is recommended for [use case] because [reason].