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/04-add-due-dates.md

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+# Prompt 04: Add Due Dates
+
+Copy and paste this into Claude Code:
+
+---
+
+Add due dates to the todo app. Requirements:
+
+- Optional date picker when adding a task
+- Due date displayed next to each task in a subtle format (e.g., "Mar 20")
+- Overdue tasks highlighted with a red accent (text or border, not the whole background)
+- Tasks due today highlighted with an amber accent
+- Sort option: by date added (default) or by due date
+- Tasks without a due date sort to the bottom when sorting by due date
+- Due dates saved in localStorage
+- Keep the existing design, categories, and search working
+
+---
+
+## What to Expect
+
+- A date picker appears in the task input area
+- Tasks show their due date on the right side
+- Overdue tasks get a red indicator
+- A sort toggle lets you switch between "added" and "due date" order