You've just downloaded the React starter kit; congratulations!
To begin, check out the examples/ directory for a bunch of examples, or check out Getting Started for more information.
In some browsers our examples won't work from the local file system; run python -m SimpleHTTPServer and visit http://localhost:8000/ to view them.
Want to start your own app? Just copy examples/basic-jsx-external and start hacking! Remember: before launching you'll want to precompile your JSX code as we do in examples/basic-jsx-precompiled; this requires doing npm install -g react-tools and then running our jsx tool. See Getting Started for more information.
Happy hacking!