Added touch id endpoint (#384)

Author: JaniJegoroff

lib/appium_lib/device/device.rb

@@ -93,6 +93,15 @@ module Device
     #   pull_folder '/data/local/tmp' #=> Get the folder at that path
     #   ```
 
+    # @!method touch_id
+    #   iOS only;  Simulate Touch ID with either valid (match == true) or invalid (match == false) fingerprint.
+    #   @param match (Boolean) fingerprint validity
+    #     Defaults to true.
+    #   ```ruby
+    #   touch_id true #=> Simulate valid fingerprint
+    #   touch_id false #=> Simulate invalid fingerprint
+    #   ```
+
     # @!method end_coverage
     #   Android only;  Ends the test coverage and writes the results to the given path on device.
     #   @param path (String) Path on the device to write too.
@@ -252,6 +261,13 @@ def pull_folder(path)
           end
         end
 
+        # TODO: TEST ME
+        add_endpoint_method(:touch_id, 'session/:session_id/appium/simulator/touch_id') do
+          def touch_id(match = true)
+            execute :touch_id, {}, match: match
+          end
+        end
+
         # TODO: TEST ME
         add_endpoint_method(:end_coverage, 'session/:session_id/appium/app/end_test_coverage') do
           def end_coverage(path, intent)