adding readme to explain what is in this directory

tools/project-editor/README

@@ -0,0 +1,5 @@
+This directory contains the Macintosh Project Editor web .cgi. The purpose
+of this .cgi is to provide an XP, web interface to Macintosh CodeWarrior 
+project files, which are in a proprietary binary format.
+
+Someone else might find this useful.