added ansible requirements.yml and update README #27
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The "ansible way" to define dependency roles is to use
ansible-galaxywith arequirements.yml. This way you don't need to worry about git-submodules and mainly you improve reproducibility because you can fix which version of the role you are using instead of pointing to master.Another possible improvement for reproducibility could be to provide a pip
requirements.txtwhich defines the specific ansible and python libraries that are tested to run the playbook but that's probably something for a different PR in case you are interested.