Add 1986/stein/stein.sh

This script runs the two commands suggested in order to get it to output
cleanly. It is suggested other systems might need another set of
characters but one can also get away with just using ./stein so this is
also done but at the end of the script to not cause any problems (it
doesn't show a newline at output).

1986/stein/README.md

@@ -19,7 +19,7 @@ into 3 lines.  Join all lines into a single line to recreate
 the original file.
 
 
-The 015 in the above printf command produces a control-N.
+The `\015` in the above `printf(1)` command produces a control-N.
 
 One some machines, a control-M control-N arg is needed
 to get the command to output cleanly: