Document linking Ring with LDAP contacts

Change-Id: Ia6eb6edb63595421c6ec11a788650abb18969092
Tuleap: #653

docs/source/connecting_to_ldap.rst

+Connecting Ring contacts to LDAP
+================================
+
+It is possible for Ring to search contacts in an LDAP directory. At the moment, this is only possible with the Gnome client. This is done by configuring gnome-contacts and evolution to search LDAP for contacts.
+
+
+Connecting gnome-contacts to LDAP
+#################################
+
+1. Open Evolution
+2. From the contacts tab, right click and select New Address Book
+
+3. Fill the requested information **depending on your LDAP configuration**. Here is an example:
+
+
+Connecting to LDAP section:
+---------------------------
+
+========================================== =============================
+   Field                                            Value
+========================================== =============================
+**Type**                                   On LDAP Servers
+**name**                                   <choose a name>
+**Autocomplete with this address book**    checked
+**server**                                 hostname of your LDAP server
+**port**                                   port of your LDAP server
+**Authentication Method**                  Using distinguished name (DN)
+**Authentication Username**                <ldap username>
+========================================== =============================
+
+Using LDAP section:
+-------------------
+
+================================= =============================
+      Field                                 Value
+================================= =============================
+**Search base**                   ou=Users,dc=enterprise,dc=net
+**Search Scope**                  Subtree
+**Download limit**                100
+**Browse until limit is reached** checked
+================================= =============================
+
+4. Launch gnome-contacts. You should be asked for your LDAP password and the LDAP contacts will appear.
+
+5. Launch Ring and your LDAP contacts will be shown.

docs/source/index.rst

@@ -11,3 +11,4 @@ Contents:
    compiling_and_installing/index
    releasing
    setting_up_turn_stun
+   connecting_to_ldap