Add documentation to run docker-compose

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+Run Wallabag in docker-compose
+==============================
+
+In order to run your own development instance of wallabag, you may
+want to use the pre-configured docker compose files.
+
+Requirements
+------------
+
+Make sure to have `Docker
+<https://docs.docker.com/installation/ubuntulinux/>`__ and `Docker
+Compose <https://docs.docker.com/compose/install/>`__ availables on
+your system and up to date.
+
+Switch DBMS
+-----------
+
+By default, Wallabag will start with a sqlite database.
+Since Wallabag provide support for Postgresql and MySQL, docker
+containers are also available for these ones.
+
+In ``docker-compose.yml``, for the chosen DBMS uncomment :
+
+- the container definition (``postgres`` or ``mariadb`` root level
+  block)
+- the container link in the ``php`` container
+- the container env file in the ``php`` container
+
+In order to keep running Symfony commands on your host (such as
+``wallabag:install``), you also should :
+
+- source the proper env files on your command line, so variables
+  like ``SYMFONY__ENV__DATABASE_HOST`` will exist.
+- create a ``127.0.0.1 rdbms`` on your system ``hosts`` file
+
+Run Wallabag
+------------
+
+#. Fork and clone the project
+#. Edit ``app/config/parameters.yml`` to replace ``database_*``
+   properties with commented ones (with values prefixed by ``env.``)
+#. ``composer install`` the project dependencies
+#. ``php app/console wallabag:install`` to create the schema
+#. ``docker-compose up`` to run the containers
+#. Finally, browse to http://localhost:8080/ to find your freshly
+   installed wallabag.
+
+At various step, you'll probably run into UNIX permission problems,
+bad paths in generated cache, etc…
+Operations like removing cache files or changing files owners might
+be frequently required, so don't be afraid !