add msbasic

msbasic/TODO.txt

@@ -0,0 +1,10 @@
+* convert messy init code into completely different
+  files without ifdefs (not much in common!)
+* move all machine specific code into separate files
+* rename all labels that point to RTS to RTSn
+* add AppleSoft comments
+* look for all " $", i.e. (zeropage) constants, replace them
+  with symbols
+* convert platform ifdefs in generic files into feature ifdefs or macros
+* reconstruct pre-CBM1, i.e. CBM1 without the patches
+* add some comments to every file