Add comment to install others apps

README.md

@@ -21,6 +21,45 @@ From command line:
 
 `sudo yunohost app upgrade -u https://github.com/YunoHost-Apps/horde_ynh`
 
+Customisation
+-------------
+
+### Install others app.
+
+The package provide some apps, but it's could be possible to install some others apps. The list of all availabe apps are listed here : https://www.horde.org/apps
+
+Before any change it's recommended to make a backup :
+```bash
+# In case of multiple instance adapt "horde" by the horde instance
+sudo yunohost backup create --verbose --ignore-system --apps horde
+```
+
+Install horde apps with pear :
+
+```bash
+# Get the horde final_path
+# In case of multiple instance adapt "horde" by the horde instance
+final_path=$(yunohost app setting horde final_path)
+
+# Set the pear command to call to stay in the horde environnement (not in the global system environnement)
+pear_cmd="$final_path/pear/pear -c $final_path/pear.conf"
+
+# Update the pear channel
+$pear_cmd channel-update pear.horde.org
+
+# Install the app that you want
+$pear_cmd install -a -B horde/APP_TO_INSTALL
+
+# Set the final permission
+# In case of multiple instance adapt "horde" by the horde instance
+chown -R www-data:horde $final_path
+
+```
+
+After you need to update the horde database schema and the horde config. So go on the horde config pannel (in the settings wheel > Preferences > Administration > Configuration). Click on "Update all DB schemas" and then on "Update all configurations".
+
+Now you should be able to use the new apps.
+
 Issue
 -----
 
@@ -31,7 +70,6 @@ ActiveSync
 
 For calendar, task and addressbook activeSync has been configured but not yet tested.
 
-
 Troubleshotting
 ---------------