Create README.md

Author: pdewacht

README.md

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+# Adlib Tracker II for OPL3LPT
+
+This is a version of Adlib Tracker II modified to support the OPL3LPT board.
+
+Note: This needs an OPL3 chip. It does not work with the OPL2LPT board.
+
+Download it from the [the Github releases tab][RELEASE].
+
+For more information on Adlib Tracker II itself, see [the official website][UPSTREAM].
+
+[RELEASE]: https://github.com/pdewacht/adt2lpt/releases/latest
+[UPSTREAM]: http://www.adlibtracker.net/