Mentioned availability of source in the readme.txt file

nickgammon · nickgammon · commit a258f7faaf50 · 2010-09-26T14:56:48.000+10:00
diff --git a/install/readme.txt b/install/readme.txt
@@ -53,6 +53,14 @@ FreeWare
 MUSHclient is distributed as FreeWare. There is no fee for using it.
 
 
+Source code
+-----------
+
+The source code for MUSHclient is available from:
+
+  http://github.com/nickgammon/mushclient/
+
+
 Operating System
 ----------------
 
