Some updates in 26/1/2018, can switch car for free if you own it from 4S store

I am still making the multiplayer mode, I think I can release it in Feb, I also spent some times to update the single player career mode.

1. now the game can save your own car, then you can switch it for free in the 4S store, it would also work in the multiplayer mode.
2. add some new models to the single player map
3. add more stores in the single player map
4. more tips for the new players