Initial commit: todo app guide with 5 prompts and examples

Complete companion repo for "Your First Hour with Claude Code" article.
Includes step-by-step prompts, example output, troubleshooting, and cost guide.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

costs.md

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+# What Claude Code Costs
+
+## Subscription Plans
+
+| Plan | Price | Best For |
+|------|-------|----------|
+| **Pro** | $20/month | Trying Claude Code, casual use, learning |
+| **Max 5x** | $100/month | Regular daily use, side projects |
+| **Max 20x** | $200/month | Heavy professional use, full workdays |
+
+All plans include access to Claude Code in terminal, VS Code, desktop app, and browser.
+
+## Which Plan to Start With
+
+**Pro at $20/month.** It gives you enough usage to complete this entire guide and explore for a few weeks. If you hit usage limits, you will see a message telling you to wait or upgrade. Nothing breaks, nothing gets charged extra.
+
+## API Access (Alternative)
+
+If you prefer pay-per-use instead of a subscription:
+
+- Average cost: about $6 per day for typical use
+- 90% of users spend less than $12 per day
+- You pay for exactly what you use, nothing when idle
+- Requires setting up an Anthropic API key
+
+The subscription is simpler and almost always cheaper for regular use. API access makes more sense for automation and CI/CD pipelines.
+
+## What Uses More Tokens (and Costs More)
+
+- Long sessions without clearing context
+- Reading very large files
+- Running many tools in a row (complex multi-file changes)
+- Using Opus model instead of Sonnet for every task
+
+## What Uses Less
+
+- Starting fresh sessions for new tasks (`/clear`)
+- Giving clear, specific prompts
+- Using Sonnet for routine tasks (rename, format, simple bugs)
+- Keeping CLAUDE.md concise (under 200 lines)
+
+## Bottom Line
+
+For this guide, any plan works. Pro is the safest way to start. You can upgrade later if you use it daily.