First draft of readme.

README.md

+# ansible script to setup otree instances
+
+## preparation
+
+### place ssl/tls certificates and key-file (unfortunately not scriptable)
+
+### install ansible and clone this project
+``sudo apt install ansible git``
+
+``git clone https://gitlab.rrz.uni-hamburg.de/bax1489/otree-ansible.git``
+
+### configure playbook
+Adapt your ``group_vars/otree_servers.yml`` from the provided example accordingly:
+
+### (optional) upload otree project
+If no git-repository with your otree project is provided, you can place a copy in ``files/<otree_username>/``.
+
+And now run the playbook.
+
+## change the configuration
+Adapt ``group_vars/otree_servers.yml`` and run the playbook again
+
+## run the playbook
+Run ``ansible-playbook site.yml``.
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