Add docker-compose example to README.

README.md

@@ -10,4 +10,24 @@ If you're binding directory except of creating volume please do proper ``chown``
 
 ```shell
 chown -R 100:101 /dir/with/data
-```
+```
+
+## Use with docker-compose
+
+You may use this image with docker-compose like that:
+
+```yaml
+version: "2.4"
+
+services:
+  rainloop:
+    restart: always
+    image: "pztrn/rainloop:1.16.0"
+    volumes:
+      - "/root/rainloop/data:/var/www/rainloop/data"
+    ports:
+      - "5480:80"
+    cpus: 2
+    mem_limit: 1G
+    memswap_limit: 0
+```