Added DAVdroid

pages/user_documentation.rst

@@ -48,10 +48,9 @@ of:
 - `Mozilla Lightning <http://www.mozilla.org/projects/calendar/lightning/>`_
 - `GNOME Evolution <http://projects.gnome.org/evolution/>`_
 - `KDE KOrganizer <http://userbase.kde.org/KOrganizer/>`_
-- `aCal <http://wiki.acal.me/wiki/Main_Page>`_, `CalDAV-Sync
+- `aCal <http://wiki.acal.me/wiki/Main_Page>`_,
-  <https://play.google.com/store/apps/details?id=org.dmfs.caldav.lib>`_
+  `CalDAV-Sync <https://play.google.com/store/apps/details?id=org.dmfs.caldav.lib>`_/`CardDAV-Sync <https://play.google.com/store/apps/details?id=org.dmfs.carddav.Sync>`_
-  and `CardDAV-Sync
+  and `DAVdroid <http://davdroid.bitfire.at>`_
-  <https://play.google.com/store/apps/details?id=org.dmfs.carddav.Sync>`_
   for `Google Android <http://www.android.com/>`_
 - `CalDavZAP <http://www.inf-it.com/open-source/clients/caldavzap/>`_
 - `CardDavMATE <http://www.inf-it.com/open-source/clients/carddavmate/>`_
@@ -214,6 +213,16 @@ CardDAV-Sync
 Set up works like CalDAV-Sync, just use .vcf instead of .ics if you enter the
 URL, e.g. ``http://example.com:5232/Username/AddressBook.vcf/``.
 
+DAVdroid
+~~~~~~~~
+
+`DAVdroid <http://davdroid.bitfire.at>`_ is a free and open-source CalDAV/CardDAV
+client that is available in Play Store for a small fee or in FDroid for free.
+
+To make it working with Radicale, just add a new DAVdroid account and enter
+``https://example.com/radicale/user/`` as base URL (assuming that your Radicale
+runs at ``https://example.com/radicale/``; don't forget to set base_prefix correctly).
+
 aCal
 ~~~~