Add README

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>

README.md

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+Collection of custom ansible lookup modules
+===========================================
+
+## `pass` Module
+
+This is a module to lookup a [pass](http://www.passwordstore.org/) password store located at `./credentials` from the toplevel playbook directory. It is a slightly modified [pipe](https://github.com/ansible/ansible/blob/stable-1.9/lib/ansible/runner/lookup_plugins/pipe.py) plugin.
+
+It takes a password path within the pass storage as argument:
+
+    - name: test pass lookup
+      debug: msg={{ lookup('pass', 'pas/to/password') }}
+
+