AI added

WELL UH 
race vs AI mode was  added finally
This was the last step in the scope for this game for me and I'm not really going to build more on it. It was mostly a thing I wanted to do in order to learn working with paths2D (Yes I'd love to do tower defense one day how did you know?)
ummm so its speed and some other stuff connected to how it works was set according to the car You choose and I tested it so it gives fair challenge on every car 

Have fun and I'm glad I could work on this project
The only thing that its missing is music and SFX, but my friend is working on it in his free time sooo I will update it from time to time:)