Add 1991/brnstnd/try.sh and try.txt

The try.txt is a file for the rot13 SORTA file. All but one of the
sorta.* files is used. The only one that is not prints out a verr long
line of output and would flood the screen. The try section in the
README.md does suggest one try it just to be complete.

1991/brnstnd/README.md

@@ -8,11 +8,10 @@ make all
 ### Try:
 
 ```sh
-./brnstnd < sorta.i2+2
-./brnstnd < sorta.iwhosort
-```
+./try.sh
 
-See also the other `sorta.*` files.
+./sorta < sorta.itailrec
+```
 
 
 ## Judges' remarks: