Create empty react app

app/.gitignore

app/.meteor/.finished-upgraders

app/.meteor/.gitignore

app/.meteor/.id

app/.meteor/packages

app/.meteor/platforms

app/.meteor/release

app/.meteor/versions

app/client/main.css

app/client/main.html

app/client/main.jsx

app/imports/api/links.js

app/imports/ui/App.jsx

app/imports/ui/Hello.jsx

app/imports/ui/Info.jsx

app/package-lock.json

app/package.json

app/server/main.js

app/tests/main.js