Added an easy way to override the faceid usage description (with a de…

…fault fallback)

README.md

@@ -160,3 +160,10 @@ window.plugins.touchid.isAvailable(
   function(msg) {alert('not available, message: ' + msg)} // error handler: no TouchID available
 );
 ```
+
+If you want to alter the usage description in the consent popup, then override the
+default empty adds an empty `NSFaceIDUsageDescription`. To do so, pass the following variable when installing the plugin:
+
+```
+cordova plugin add cordova-plugin-touch-id --variable FACEID_USAGE_DESCRIPTION="For easy authentication"
+```

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cordova-plugin-touch-id",
-  "version": "3.3.0",
+  "version": "3.3.1",
   "description": "Scan the fingerprint of your user with the TouchID sensor, or the user's Face with Face ID on iPhone X",
   "cordova": {
     "id": "cordova-plugin-touch-id",

plugin.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
         id="cordova-plugin-touch-id"
-        version="3.3.0">
+        version="3.3.1">
 
   <name>Touch ID</name>
 
@@ -36,6 +36,12 @@
       </feature>
     </config-file>
 
+    <!-- Usage description of Face ID for iOS 11+ -->
+    <preference name="FACEID_USAGE_DESCRIPTION" default=" " />
+    <config-file target="*-Info.plist" parent="NSFaceIDUsageDescription">
+      <string>$FACEID_USAGE_DESCRIPTION</string>
+    </config-file>
+
     <framework src="LocalAuthentication.framework" />
     <framework src="Security.framework" />