[ADD] web_widget_datepicker_options

* use include instead of extend

* add README.rst

* update api doc link in readme.rst

* remove description from __oe__ since it is in README.rst

* add OCA icon and AGPL badges

* add datepicker.js through assets_backend

README.rst

@@ -0,0 +1,48 @@
+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+    :alt: License: AGPL-3
+
+Datepicker Widget Options
+=========================
+
+This module allows passing options to the jquery datepicker for fields that use
+the datepicker widget. The option are passed as-is and are not validated.
+
+To see all supported options, see the `API documentation
+<http://api.jqueryui.com/datepicker/>`_.
+
+
+Usage
+=====
+
+You must pass all options through the "datepicker" field in the options::
+
+    ...
+    <field name="date" options="{'datepicker':{'yearRange': 'c-100:c+0'}}"/>
+    ...
+
+Known issues / Roadmap
+======================
+
+* Absolutely no validation on options.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Vincent Vinet <vincent.vinet@savoirfairelinux.com>
+
+Maintainer
+----------
+
+.. image:: http://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: http://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose mission is to support the collaborative development of Odoo features and promote its widespread use.
+
+To contribute to this module, please visit http://odoo-community.org.
+