added README.txt

contrib/README.txt

@@ -0,0 +1,31 @@
+This directory contains Factor code that is not part of the core
+library, but is useful enough to ship with the Factor distribution.
+
+- contrib/aim/ -- AOL Instant Messenger client library (Doug Coleman)
+
+- contrib/algebra/ -- infix math syntax (Daniel Ehrenberg)
+
+- contrib/concurrency/ -- Erlang/Termite-style concurrency (Chris Double)
+
+- contrib/cont-responder/ -- additional examples and tools for the
+  continuation-based web framework (Chris Double)
+  
+- contrib/crypto/ -- MD5 and SHA1 cryptographic hashes (Doug Coleman)
+
+- contrib/gl/ -- OpenGL binding (Alex Chapman)
+
+- contrib/parser-combinators/ -- Lazy lists and Haskell-style parser
+  combinators (Chris Double)
+
+- contrib/postgresql/ -- PostgreSQL binding (Doug Coleman)
+
+- contrib/space-invaders/ -- Intel 8080-based Space Invaders arcade
+  machine emulator (Chris Double)
+
+- contrib/sqlite/ -- SQLite binding (Chris Double)
+
+- contrib/coroutines.factor -- coroutines (Chris Double)
+
+- contrib/dlists.factor -- double-linked-lists (Mackenzie Straight)
+
+- contrib/xml.factor -- XML parser and writer (Daniel Ehrenberg)