Create FallingRocksGame

/*Falling Rocks Console GameC#
 Implement the "Falling Rocks" game in the text console. A small dwarf stays at the bottom of the
 screen and can move left and right (by the arrows keys). A number of rocks of different sizes and
 forms constantly fall down and you need to avoid a crash.
 Rocks are the symbols ^, @, *, &, +, %, $, #, !, ., ;, - distributed with appropriate density.
 The dwarf is (O). Ensure a constant game speed by Thread.Sleep(150).
 Implement collision detection and scoring system.*/