Create configuration_apps.rst

added description of apps configuration settings.

admin_manual/configuration_apps.rst

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+Apps Configuration
+==================
+
+After you have installed ownCloud you might realise that it would be nice to
+provide this or that function on top of the core functionality in your own cloud.
+The first stop to look for the desired enhancement is to check the ownCloud app
+store (http://apps.owncloud.com/). There you will find a lot of ready-to-use
+apps provided by the ownCloud community.
+
+Parameters
+----------
+
+  If you want to allow the installation of apps from the app store you have to
+  set ``appstoreenabled`` parameter, but this can only be done if at least one
+  of the configured apps paths is writeable.
+  ::
+    "appstoreenabled" => true,
+
+  The ``appstoreurl`` is used to set the http path to the ownCloud app store.
+  (The server should understand OCS (Open Collaboration Services).
+  ::
+    "appstoreurl"     => "http://api.apps.owncloud.com/v1",
+
+  The key ``path`` defines the absolute file system path to the app folder.
+  The key ``url`` defines the http web path to that folder, starting at the
+  ownCloud web root. The key ``writable`` indicates if a user can install
+  apps in that folder.
+  ::
+    "apps_paths"      => array (
+                           0 => array (
+                                  "path"     => "/var/www/htdocs/owncloud/apps",
+                                  "url"      => "/apps",
+                                  "writable" => true,
+                                ),
+                         ),
+
+  Finally you can enable checks for malicious code fragments of 3rd-party apps
+  by setting ``appcodechecker`` parameter.
+  ::
+    "appcodechecker"  => false,