Add privacy policy inside application and repository

This should permit to prevent Google play removal due to this missing information.

src/main/res/menu/activity_main_drawer.xml

@@ -22,6 +22,10 @@
             android:id="@+id/nav_appinfo_perms"
             android:icon="@drawable/ic_information"
             android:title="@string/action_appinfo_perms"/>
+        <item
+            android:id="@+id/nav_appinfo_privacy_policy"
+            android:icon="@drawable/ic_information"
+            android:title="@string/action_appinfo_privacy_policy"/>
     </group>
 
     <item android:title="@string/communicate">

src/main/res/menu/menu_privacy_policy.xml

@@ -0,0 +1,10 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:context="fr.unix_experience.owncloud_sms.activities.PrivacyPolicyActivity">
+    <item
+        android:id="@+id/action_settings"
+        android:orderInCategory="100"
+        android:title="@string/action_settings"
+        app:showAsAction="never" />
+</menu>