Added a tiny documentation

CHANGES.rst

@@ -5,4 +5,5 @@ Changelog
 --------------------
 
 - Initial release
-  [cedricmessiant]
+  [cedricmessiant]
+

README.rst

@@ -3,3 +3,39 @@
 Introduction
 ============
 
+A Plone add-on that provides a directory where you create persons, organizations, sub-organizations and positions.
+
+How-to
+======
+
+First, create a directory in your site. This directory will contain all the informations related to your contacts.
+
+You can then add organizations to his directory. An organization can contain organizations (such as services, divisions or department) or positions (such as CEO, mayor or developer).
+
+You can also add persons to this directory. A person is a physical person that can hold one or more positions or be member of one or more organizations. To associate a person with an organization or a position, add a held position content type in the person's context.
+
+Modify your directory to customize the organization types and the position types that you will associate with your organizations, sub-organizations and positions.
+
+Look at the test data profile collective.contact.core test data for detailed examples.
+
+Installation
+============
+
+* Add collective.contact.core to your eggs.
+* Re-run buildout.
+* Install the product in your plone site.
+
+Tests
+=====
+
+This add-on is tested using Travis CI. The current status of the add-on is :
+
+.. image:: https://secure.travis-ci.org/collective/collective.contact.core.png
+    :target: http://travis-ci.org/collective/collective.contact.core
+
+Credits
+=======
+
+Have an idea? Found a bug? Let us know by `opening a ticket`_.
+
+.. _`opening a ticket`: https://github.com/collective/collective.contact.core/issues