Add custom event into the example

[skolesnyk]

Track inapp purchase without verification

public function trackInappPurchase(product:String, revenue:Number, currency:String):void {
            var param:String = "af_purchase";
            var value:Object = {
                "af_content_id": product,
                "af_revenue": revenue ,
                "af_currency": currency
            };
            appsFlyer.trackEvent(param, JSON.stringify(value));

        }