add notes about C64 KERNAL

c64/kernal/public_interfaces.md

@@ -0,0 +1,7 @@
+# Public Interfaces of the C64 KERNAL
+
+In terms of the goal of ensuring interoperability, it is vital that the public interfaces match.
+We believe that this activity very closely matches that described in section 12 of
+http://classic.austlii.edu.au/au/journals/JlLawInfoSci/2003/2.html
+and thus is allowable.
+