Bit better readme for the frontend project (#100)

Co-authored-by: ilesoft <[email protected]>

README.md

@@ -1,3 +1,43 @@
 # Tayttopaikka
 
 Basic React app to provide UI for Tayttopaikka. Running at https://tayttopaikka.fi
+
+## Tech
+
+This project uses Vite and React. Bootstrap is used for some general styles,
+but we mostly use CSS modules powered with `Sass`.
+
+## Local development
+
+Copy example .env file and tweak some variables if needed. **Please notice that every .env variable is public so do not store any real secrets there!**
+
+```
+cp .env.example .env
+```
+
+Run the application in local environment
+
+```
+npm install
+npm start
+```
+
+## Deployment
+
+When something is pushed to the `main` branch, it is automatically deployed
+to production servers. See `fly-deploy.yml` for the deployment pipeline
+and `fly.toml` for the container configuration.
+
+The application is deployed as a container, which has been defined in
+`Dockerfile`
+
+### What really happens
+
+When the container is being built, it runs `npm run build` and creates an application
+bundle which is optimized for production use. The bundle is then copied for
+`Nginx` that serves the application to the user.
+
+## Contributing
+
+Fork the application and do your thing. Make sure that you run the `enforce-style` script and fix possible errors before opening a PR. Contact @Akzuu or @ilesoft
+if you need assistance.