Add basic README with build instructions

README.md

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+## BetterTelnet
+
+Building BetterTelnet requires *CodeWarrior Gold version 10*, released in 1996 and downloadable from
+[Macintosh Garden](http://macintoshgarden.org/apps/codewarrior-10-gold)
+Note that this is a totally different version from CodeWarrior Development Studio 10, released in 2005.
+
+- I personally used Mac OS X 10.4, with CodeWarrior running in the Classic environment.
+
+- CodeWarrior IDE 1.7 requires that file type codes be set correctly, run the following commands in a terminal:
+```
+/Developer/Tools/SetFile -t TEXT source/*/*.c
+/Developer/Tools/SetFile -t TEXT source/*/*.h
+/Developer/Tools/SetFile -t TEXT source/*/*.pch
+/Developer/Tools/SetFile -t TEXT source/*/*/*.c
+/Developer/Tools/SetFile -t TEXT source/*/*/*.h
+/Developer/Tools/SetFile -t TEXT source/TelnetHelp.bh
+/Developer/Tools/SetFile -t TEXT source/*.r
+/Developer/Tools/SetFile -t MPLF source/Libraries/ICGluePPC.lib
+/Developer/Tools/SetFile -t "OBJ " source/Libraries/ICGlue.o
+```
+
+- Then, un-MacBinary the telnet.68k.µ.bin and telnet.ppc.µ.bin project files, open in CodeWarrior
+IDE 1.7, and Make (cmd-M).