Update 'README.md'

README.md

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 # CHIP-8_Emulator
 
+My attempt at making a CHIP-8 emulator.
+
+Has some graphical issues, but more annoyingly seems to have collision detection issues.
+
+Number set isn't implemented yet so some games that rely on it (pong) won't work, and sound isn't implemented yet (but the sound clock is there so it should be trivial).