added initial source and readme

README.md

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+# UltraCIC_C
+Nintendo64 CIC clone written in C
+
+This should run on every MCU which is fast enough to
+handle the IO operations.
+You just have to implement the low level gpio functions:
+    - ReadBit() and
+    - WriteBit().
+
+Hardware connections
+Data Clock Input (DCLK): CIC Pin 14
+Data Line, Bidir (DIO):  CIC Pin 15