updated the readme.

Change-Id: I03b77765d05ec87e9c2035ab08624fac7f17dc39
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

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-# agl-identity
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+# agl-identity
+
+## Binding
+
+This binding provide the following API:
+* `login`: Try to login the specified identity.
+* `logout`: Try to logout the specified identity.
+* `open_session`: Try to authenticate an identity using PAM.
+* `close_session`: Try to close an opened session.
+* `set_data`: Store a json for an identity/application pair.
+* `get_data`: Get a json for an identity/application pair.
+
+# PAM's module
+
+This binding make use of PAM to authenticate a user.
+A sample PAM module is provided, but you can write your own to allow different authentication workflows.
+
+The sample module assume there is a `identity.json` file located at the root of an usb-stick. When the user plug-in the key, an udev's rule notify the binding and make a call to the `pam_auth` verb. The binding will then call the PAM module to authenticate the user. The sample PAM module will mount and read the file and open a session if the identity is valid.
+
+When the user unplug the usb-stick, udev will notify the binding which will close the session.
+
+# Udev's rules
+
+The sample PAM module work with usb-stick. In order to detect plug and unplug action, some udev's rules are required.