Update Constants.cs

Author: sanyandreichuk

sample/Sample/Constants.cs

@@ -9,7 +9,7 @@ namespace Sample
 {
     public static class Constants
     {
-        public const string ApiUrl = "https://notifo.easierlife.com";
-        public const string UserApiKey = "7hht0pqtsqyvkeco9h7434wrnbrpld6s1hmdu08e0tkx";
+        public const string ApiUrl = {API_URL};
+        public const string UserApiKey = {USER_API_KEY};
     }
 }