Add setup and run instruction in the readme

README.md

@@ -8,10 +8,40 @@ Contributions to this project are welcome!
 
 If you want to contribute, please read the [contributing guide](./CONTRIBUTING.md).
 
-## Setup and Run
+## Setup
+
+tl;dr: Install Flutter, clone the repo, run in order:
+- `flutter pub get`
+- `dart run build_runner watch`
+- `flutter analyze --watch`,
+
+and you're ready to code!
 
 See [the dev environment docs](./docs/setting_dev_env.md) for detailed instructions.
 
+## Running the app
+
+To run the app, you can use the following command:
+
+```bash
+# if not already done, run the code generation
+dart run build_runner build
+
+# run the app on all available devices
+flutter run -d all
+```
+
+## Running tests
+
+To run the tests, you can use the following command:
+
+```bash
+# if not already done, run the code generation
+dart run build_runner build
+
+flutter test
+```
+
 ## Internationalisation
 
 Do not edit the `app_en.arb` file by hand, this file is generated.