Startup doc

Dockerfile

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+FROM reactnativecommunity/react-native-android
+
+WORKDIR /app
+ADD ./PyroApp .
+
+RUN npm install
+
+CMD npm run start

README.md

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-# pyro-app
+# pyro-app
+
+## Installation (docker)
+
+This install method requires you to already have Docker and Docker-compose installed on your system. More info [here](https://docs.docker.com/engine/install/).
+
+### Init node.js modules and start metro server
+
+In a CLI, go to the root folder and ...
+
+`docker compose up -d`
+
+It will install the required dependencies and init the Metro server.
+
+### Connect an android device to test the app on
+
+For this part, you'll need an android phone wirelessly connected on the same network as your docker host. 
+
+First, [activate the developer options](https://developer.android.com/studio/debug/dev-options) on your device.
+
+Then, retrieve the IP, port and code from your android device in the "wireless debugging" parameters, as described [here](https://developer.android.com/tools/adb).
+
+Start an interactive shell into your new docker container by using: `docker exec -it pyro-app bash`
+
+In this prompt, pair your android device using: 
+`adb pair {ipaddr}:{port}`
+
+... Where {ipaddr} is your android's IP address and {port} is the specified port.
+Then type in the specified code to pair your device.
+
+### Start it all
+
+Now, to start the app: `npm run android` (in the container prompt)
+
+Note: this can be a **long** process. 
+Your android device should display the app at some point.
+
+## troubleshooting
+
+### Port is already used 
+
+If you receive an error "port already used", you can change the default metro port in the package.json, to specify your own custom port (default is 8081).
+
+`"start": "react-native start --port 8090",`

docker-compose.yml

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+name: pyro-app
+
+services:
+  app:
+    container_name: pyro-app
+    build: .
+    volumes:
+      - ./PyroApp:/app
+      - /app/node_modules # ignore node_modules
+    network_mode: host
+    restart: unless-stopped