Update README.md with docker usage

README.md

@@ -2,23 +2,40 @@
 
 # lineageos-ota-server
 
-OTA Server for LineageOS.  
+OTA Server for LineageOS.  The OTA server supports a single device, if you intend to support multiple devices, you just create an additional OTA server instance for that device.  
 
+### docker compose example
+
+The service listens on port 8080 by default.  Mount the output directory for the builds of the device you wish to serve to the /out folder.  Also, mount a persistent public directory which will be served publicly.  The public folder can be shared across multiple OTA server instances if you wish.  
+
+```yaml
+
+version: '3.8'
+
+  lineageos-ota:
+    image: registry.deadbeef.codes/lineageos-ota-server:latest
+    restart: always
+    expose:
+      - "8080"
+    volumes:
+      - /data/android/lineage/out/target/product/sunfish:/out
+      - /data/android/public:/public
+    
+```
 
 ### How to point device to OTA server
 
-We include the URL as a system build.prop by doing the following:
+The recommended way is to include the configuration inside your build of the ROM.  We do this by by including the URL as a system build.prop by doing the following:
 
 Create new file /data/android/lineage/vendor/lineage/build/core/deadbeef-ota.mk
 
 ```makefile
-# deadbeef.codes LineageOS OTA update server
+# deadbeef.codes LineageOS OTA update server - replace with your own URL
 ADDITIONAL_SYSTEM_PROPERTIES += \
         lineage.updater.uri=https://lineageos-ota.deadbeef.codes 
 
 ```
 
-
 Edit /data/android/lineage/vendor/lineage/build/core/main.mk to include deadbeef-ota.mk
 
 ```makefile