add docs

docs/en/index.rst

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+wallabag documentation
+======================
+
+.. image:: ../img/wallabag.png
+   :alt: wallabag logo
+   :align: center
+
+**wallabag** is a read-it-later application: it saves a web page by
+keeping content only. Elements like navigation or ads are deleted.
+
+The main documentation for the site is organized into a couple sections:
+
+* :ref:`user-docs`
+* :ref:`admin-docs`
+* :ref:`dev-docs`
+
+.. _user-docs:
+
+.. toctree::
+   :maxdepth: 2
+   :caption: User Documentation
+
+   user/create_account
+   user/login
+   user/configuration
+   user/first_article
+
+user/organize
+user/filters
+User/read_an_article
+User/search
+User/epub_conversion
+User/issue_with_article
+User/rss_feed
+User/import_export
+
+.. _admin-docs:
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Admin Documentation
+
+   Administrator/install
+   Administrator/update
+   Administrator/hidden_options
+   Administrator/multiusers
+   Administrator/sessions
+
+.. _dev-docs:
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Developer Documentation
+
+   Developer/write_config_files
+   Developer/create_new_theme
+   Developer/git_repo