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>

prompts/05-make-responsive.md

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+# Prompt 05: Make It Mobile-Friendly
+
+Copy and paste this into Claude Code:
+
+---
+
+Make the todo app responsive and mobile-friendly. Requirements:
+
+- Works well on phone screens (375px wide and up)
+- Touch-friendly: buttons and inputs are at least 44px tall
+- Category filters wrap to multiple lines on small screens
+- Search bar is full width on mobile
+- Task text does not overflow, long text wraps properly
+- Add a proper viewport meta tag if missing
+- Swipe-to-delete would be a bonus but not required
+- Test: the app should look good on both a phone screen and a desktop monitor
+- Keep all existing functionality working
+
+---
+
+## What to Expect
+
+- Open `index.html` on your phone (or use browser dev tools to simulate a phone screen)
+- Everything fits and is easy to tap
+- No horizontal scrolling
+- Filter buttons wrap neatly on small screens