More README.md files updated

Some of the files modified include some of the files modified yesterday;
others were not modified yesterday. I backtracked as I noticed some
sections are missing in earlier README.md files. However more have to be
checked in earlier years. I'm committing now as I have to do other
things and am likely done for the day.

1986/marshall/README.md

@@ -17,6 +17,10 @@ main() and the third arg was an int. He notes that he tried to keep the picture
 as close to the original. The line lengths are the same but some spaces had to
 be changed to non-spaces. Thank you Cody for your help!
 
+## Try:
+
+	./marshall
+
 # Judges' comments:
 
 This program prints the name of the picture.  The layout is somewhat