Adding docker-compose

This first commit contains a docker-compose with:

- front container
- traefik for reverse proxy

back container will be added when ready.

README.md

@@ -7,3 +7,26 @@ Work Adventure is a web-based collaborative workspace for small to medium teams
 
 In Work Adventure, you can move around your office and talk to your colleagues (using a video-chat feature that is
 triggered when you move next to a colleague).
+
+
+## Getting started
+
+Install Docker.
+
+Run:
+
+```
+docker-compose up
+```
+
+The environment will start.
+
+You should now be able to browse to http://workadventure.localhost/ and see the application.
+
+Note: on some OSes, you will need to add this line to your `/etc/hosts` file:
+
+**/etc/hosts**
+```
+workadventure.localhost 127.0.0.1
+```
+