* Method allows to initialize the user. It applies when SDK initialization or user relogin.
* @param String activeUserId - unique cross-platform user identifier (max. 64 symbols)
[DevToDev setUserID:@"activeUserId"];
* Method sets the current user level. Using this method allows to actualize the SDK user data
* in game cross-platform applications.
* @param NSUInteger level - number of current game level of the user
[DevToDev setCurrentLevel:level];
* devtodev App Id and Secret key can be found in the devtodev application
* settings page ("Settings" → "SDK" → "Integration")
[DevToDev initWithKey:applicationId andSecretKey:secretKey];