Added ReadMe.txt with version history.

ReadMe.txt

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+SID Player v1.2
+---------------
+
+Version 1.2 (26/8/2008)
+- faster 6502 core with addressing modes fully inlined
+- combined N/Z flags to reduce result setting work
+
+Version 1.1 (7/6/2007)
+- improved 6502 core with full write trapping
+- bug fix to indirect-indexed-addressing-using-X opcode
+- added key mask support for music player navigation
+- added 60 and 100Hz playback
+- increased maximum tune size from 16K to 48K
+
+Version 1.0 (7/12/2004)
+- initial release
+
+
+Written by Simon Owen
+http://simonowen.com/sam/sidplay/