Update readme.

README.md

@@ -1,22 +1,38 @@
-## lightflow
+# lightflow
 
 - Smooth lighting transitions with hue lights.
 - Transition light colours and brightnesses gradually.
 - Set a target brightness or colour, transition time, and let fly...
 
-Create a config file at `server/src/config/private.ts` which looks like this:
+## Usage
 
-```typescript
-export const HUE_USERNAME = "GET_ME_FROM_THE_HUE_DOCS";
+Firstly, follow the [Hue developer
+instructions](https://developers.meethue.com/develop/get-started-2/). Create a
+new "app" on your bridge and save the `username` it generates for you.
 
-export const STEP_INTERVAL_MS = 10 * 1e3; // seconds
-```
+Then run the `chmac/lightflow` docker container on the same network as your hue
+bridge. It runs on port `4000`. If you're using docker-compose, this should be enough:
+
+```yaml
+version: "3.8"
 
-To start run `./build.sh`.
+services:
+  lightflow:
+    image: chmac/lightflow
+    environment:
+      - HUE_IP=192.168.0.XXX
+    restart: unless-stopped
+    ports:
+      - "4000:4000"
+```
 
-Then run `node server/build/`
+### Advanced
 
-Lightflow should now be running on port 4000.
+Some aspects of the application can be controlled via environment variables set
+via docker.
 
-If you really want to use this and have challenges, open an issue here and I'll
-do what I can to help out.
+- If you have more than 1 bridge on your network, or if your bridge has had
+multiple IP addresses, the server will log an error on startup. Figure out the
+IP of your hue bridge (see the hue docs above) and then set it in `HUE_IP`.
+- To enable debugging on the graphql server set `DEBUG_GRAPHQL` to a string.
+- To enable debugging of the application set `DEBUG` TO `*` or `lightflow:*`.