Generating a skyline 1

- raw of cubes to construct the skyline
-c# script called  SkylineManager
- new empty object  named Managers
- turning skyline cubes into prefab
-start position variable
-variable named numberOfCubes
-private variable named nextPosition.
- use of a loop for spawning the initial row of cubes
- Start Position to (0, -1, 0)
-Number of Objects to 10

_ in the runner script

- static variable named distanceTraveled to Runner