Write Usage Documentation

[abhibongale]

Write comprehensive user documentation covering setup, usage, troubleshooting, and workflows.

Documentation Structure

Create docs/usage.md:

# StackBox Usage Guide

## Quick Start

\`\`\`bash
# 1. Initialize
stackbox init ironic-basic --ironic-repo ~/code/ironic

# 2. Run tests
stackbox test

# 3. Make changes
vim ~/code/ironic/ironic/conductor/manager.py

# 4. Rebuild
stackbox rebuild ironic

# 5. Test again
stackbox test
\`\`\`

## Commands Reference

### stackbox init
...

### stackbox test
...

### stackbox rebuild
...

## Troubleshooting

### Tests fail
...

### Rebuild is slow
...

Acceptance Criteria

• README.md updated with quick start
• Full usage guide written
• All commands documented
• Troubleshooting section
• Examples provided
• Links to resources