Rename hint.txt and hint.text to README.md

1987/wall/README.md

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+# Most Useful Obfuscation
+
+Larry Wall  
+Unisys - System Development Group Santa Monica  
+9132 Kester Ave  
+Panorama City, CA  91402  USA  
+
+## To build:
+
+        make all
+
+## Judges' comments:
+
+### Try:
+	lwall | bc | lwall
+	input:	x*x
+	input:	c^2
+
+### Also try:
+	lwall | bc   and   lwall | cat
+
+What we found amazing was how the flow of control was transferred
+between subroutines.  Careful inspection will show that the array of
+pointers to functions named 'vi' refers to functions which seem to not
+be directly called.  Even so, these pointers to functions are being
+used as an argument to signal.  Can you determine why this is being
+done and how it is being exploited?
+
+Some compilers complained about this file, so we changed: '=++I' to '= ++I'.
+
+Copyright (c) 1987, Landon Curt Noll & Larry Bassel.
+All Rights Reserved.  Permission for personal, educational or non-profit use is
+granted provided this this copyright and notice are included in its entirety
+and remains unaltered.  All other uses must receive prior permission in writing
+from both Landon Curt Noll and Larry Bassel.