Start to write docu for installation

Author: iimog

docs/installation.rst

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+Installation
+============
+
+Installation of TBro is straightforward and easy using preconfigured `docker <https://www.docker.com/>`_ containers.
+See `docker documentation <https://docs.docker.com/engine/installation/>`_ on how to install docker on your machine.
+
+After installation of docker execute the following commands to pull the docker images:
+ 
+::                                                                                                                                          
+                                                                                                                                            
+        docker pull greatfireball/generic_postgresql_db
+        docker pull tbroteam/generic_chado_db_reload
+        docker pull tbroteam/tbro_worker_ftp
+        docker pull tbroteam/tbro_worker
+        docker pull tbroteam/tbro_apache
+        docker pull tbroteam/tbro_demo
+
+
+Preload demo data
+-----------------
+