Added tutorial level + Relased DEMO [DEVLOG #1]

Added in last 2 days:

1. Double Jump
2. Dash
3. Enemies
4. Camera follow
5. Colletables (Coins Only)
6. Spikes
7. Tutorial Level

The name for the game is not final yet. I will think about better name than "Space Jump" when the game will be finished. But for now it will stay as Sace Jump.

The assets from Kenny that i used in the demo version will change in final relase. 

Thats all for now.

~florkek