part 12 done

Pt12/part12-containers-applications/todo-app/old-todo-frontend/README.md

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+# React application
+
+This application is created from create-react-app.
+
+Install dependencies with `npm install`
+
+You can run the application in development mode with `npm start`
+
+You can build static files for production release with `npm run build`
+
+You can run tests with `npm run test`
+
+## Environment variables
+
+Use REACT_APP_BACKEND_URL to set where the backend for this application is.