Added new EventData typedef

Author: photonstorm

src/input/EventData.js

@@ -0,0 +1,16 @@
+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2019 Photon Storm Ltd.
+ * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
+ */
+
+/**
+ * A Phaser Input Event Data object.
+ * 
+ * This object is passed to the registered event listeners and allows you to stop any further propagation.
+ * 
+ * @typedef {object} Phaser.Input.EventData
+ * 
+ * @property {boolean} [cancelled=false] - The cancelled state of this Event.
+ * @property {function} stopPropagation - Call this method to stop this event from passing any further down the event chain.
+ */