usage

```swift
class AppDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        let tabC = UITabBarController()
        let mC = MCoordinator()

        coordinator = MainCoordinator(tabBarController: tabC, tabs: [mC])
        coordinator?.start()
        window?.rootViewController = tabC
        return true
    }
}
```