[doc] add quickstart draft

doc/source/quickstart.rst

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+..
+
+Quickstart
+==========
+
+If you already know how to use ansible please follow this quickstart guide to begin working following the lilik architecture.
+
+Infrastructure
+-------------
+
+There are specific x for machines in every architecture and lilik is not different, here is a list of the machines we think as essential.
+
+* vm_hosts
+* reverse_proxy
+
+Obviously