added instruction for how to start the game

Author: codex128

README.md

@@ -4,9 +4,10 @@ Infinite-runner style game built with JMonkeyEngine 3.
 ![gameplay](https://github.com/codex128/Forever/blob/master/assets/Release%20Resources/forever%20gameplay.png)
 
 # Instructions
+* Press any key to begin.
 * Move left/right with the arrow keys or A/D.
 * Jump with space.
-* The game is infinite, but it provides some satisfaction every 1000 steps.
+* The game is infinite, but provides a "period of satisfaction" every 1000 steps.
 
 # Platform Support
 Linux is supported.<br>