Update README.md (#1100)

README.md

@@ -123,6 +123,30 @@ docker-compose up
 (Note that on MacOS you may have to run `TMPDIR=/private$TMPDIR docker-compose up` if
 `$TMPDIR` contains a symbolic link that cannot be mounted by Docker.)
 
+Use on existing cocker-compose project. Add in existing services. The project can be found in docker hub, no need to download or clone source:
+
+```
+services:
+...
+  localstack:
+    image: localstack/localstack
+    ports:
+      - "4567-4584:4567-4584"
+      - "${PORT_WEB_UI-8080}:${PORT_WEB_UI-8080}"
+    environment:
+      - SERVICES=${SERVICES- }
+      - DEBUG=${DEBUG- }
+      - DATA_DIR=${DATA_DIR- }
+      - PORT_WEB_UI=${PORT_WEB_UI- }
+      - LAMBDA_EXECUTOR=${LAMBDA_EXECUTOR- }
+      - KINESIS_ERROR_PROBABILITY=${KINESIS_ERROR_PROBABILITY- }
+      - DOCKER_HOST=unix:///var/run/docker.sock
+    volumes:
+      - "${TMPDIR:-/tmp/localstack}:/tmp/localstack"
+  ```    
+
+
+
 ## Configurations
 
 You can pass the following environment variables to LocalStack: