Time for action – positioning the asteroids

1. Add methods to generate random locations and velocities to the AsteroidManager class:

   private Vector2 randomLocation()
   {
       Vector2 location = Vector2.Zero;
       bool locationOK = true;
       int tryCount = 0;
   
       do
       {
           locationOK = true;
           switch (rand.Next(0, 3))
           {
               case 0:
                   location.X = -initialFrame.Width;
                   location.Y = rand.Next(0, screenHeight);
                   break;
   
               case 1:
                   location.X = screenWidth;
                   location.Y = rand.Next(0, screenHeight);
                   break;
   
               case 2:
                   location.X = rand.Next(0, screenWidth);
                   location.Y = -initialFrame.Height;
                   break;
   
           }
           foreach (Sprite asteroid in Asteroids)
           {
               if (asteroid.IsBoxColliding(
                   new Rectangle(
                       (int)location.X, 
                       (int)location.Y, 
         ...