Add an initial basic dashboard (#547)

Author: balloob

dashboard/.gitignore

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+node_modules
+dist

dashboard/README.md

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+# Matter Dashboard
+
+This is the dashboard for the Python Matter Server project. It is meant to be used for debugging and testing.
+
+## Development
+
+Install the dependencies:
+
+```bash
+script/setup
+```
+
+Run the development server:
+
+```bash
+script/develop
+```
+
+The dashboard will be available at [http://localhost:5010](http://localhost:5010). When you open it from localhost, it will ask you for your websocket server URL.
+
+The websocket URL of the Home Assistant add-on will be something like `ws://homeassistant.local:5080`. If you are running the Python Matter Server locally, it will be `ws://localhost:5080`.
+
+If you want to use the dashboard with the Python Matter Server Home Assistant add-on, you need to configure it to make the WebSocket server available on the network. Go to the [add-on info page](https://my.home-assistant.io/redirect/supervisor_addon/?addon=core_matter_server), click on Configuration. Under "Network", show disabled ports and enter the port you want to use for the WebSocket server (e.g. 5080). Then, click "save" and restart the add-on when prompted.
+
+## Production build
+
+The production build is generated when you run
+
+```bash
+script/build
+```
+
+The folder `dist/web` will contain the build that can be served by any web browser.