Update README.md

README.md

 
 In case you prefer using Docker:
 
-You need to install docker on your server first (see [here](https://docs.docker.com/install/linux/docker-ce/debian/))
+You need to install docker on your server first (see [here for debian](https://docs.docker.com/install/linux/docker-ce/debian/) or [here for windows]([docker toolbox](https://docs.docker.com/toolbox/toolbox_install_windows/)))
+
 Make sure `docker.service` is started correctly.
 
     systemctl status docker.service
 
 
 All docker images are available here : https://hub.docker.com/u/algoo/
+More information about build docker image: https://github.com/tracim/docker_tracim
+
+Description of versioning:
+
+* algoo/`tracim:latest` is latest stable image from branch master
+* algoo/`tracim:<$tag>` is a stable tag image from branch master
+* algoo/`tracim_testing:latest` is a latest image from branch develop
+* algoo/`tracim:unstable` is a latest unstable image from branch develop
 
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