Add instructions

README.md

@@ -1,3 +1,13 @@
 # Dodona docker image
 
 This repository contains the files to create a Dodona docker image. A nightly version is published every night based on the develop branch of the main Dodona repo.
+
+## Usage
+
+```bash
+git clone https://github.com/dodona-edu/dodona
+git clone https://github.com/dodona-edu/docker-image
+cp docker-image/* dodona/
+cd dodona/
+docker-compose up -d
+```