Update README.md

README.md

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 # ChatApp
 Simple multiparty chat application based on websockets
+
+# Build
+
+## Requirements
+
+The Chat Application will be hosted on your local host! All you need to install is [Docker Engine](https://docs.docker.com/engine/install/) and [Docker Compose](https://docs.docker.com/compose/install/).
+
+## Run
+
+Ensure that your docker engine is running. From the top level directory of this git repository run the following command:
+
+``` 
+docker-compose up -d
+```
+
+This command will build the images of all the application services and it will launch all the services.
+
+To stop the application and delete all the containers:
+```
+docker-compose down
+```
+
+To temporarily stop the application, but keep the containers and their associated data:
+```
+docker-compose stop
+```