Add initial stock dashboard layout and Alpha Vantage quote lookup

[biscocho-droid]

Motivation

• Scaffold a modern single-page stock dashboard so further features (indices ticker, charts, watchlist, portfolio, news) can be iterated on safely.
• Provide a polished dark-mode UI with glassmorphism styling and a working stock quote fetch as the first deliverable.

Description

• Add a Vite + React project shell with vite.config.js, package.json, and entry points index.html and src/main.jsx to bootstrap the app.
• Introduce global styling and Tailwind configuration via tailwind.config.js, postcss.config.js, and src/styles/index.css implementing dark-mode, glass-card utilities, and subtle gradients.
• Implement StockLookup component (src/components/StockLookup.jsx) that fetches quotes from Alpha Vantage GLOBAL_QUOTE, parses key fields, and displays an animated price card using framer-motion.
• Add app layout (src/App.jsx), README (README.md), .env.example for VITE_ALPHA_VANTAGE_KEY, and .gitignore to document usage and next steps.

Testing

• Attempted to install dependencies with npm install, but the run failed with a 403 Forbidden from the npm registry so the dev server could not be started and no runtime tests were executed.

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Codex Task