Add 2018/ciura/try.alt.sh

This also fixes the missing reference to try.sh in the README.md file.

Using both scripts one can see the problem the alt code has that was
fixed by the author.

thanks-for-help.md

@@ -4417,7 +4417,8 @@ Finally Cody added the [try.sh](/2018/burton2/try.sh) script.
 
 ## <a name="2018_ciura"></a>[2018/ciura](/2018/ciura/prog.c) ([README.md](/2018/ciura/README.md))
 
-[Cody](#cody) added the [try.sh](/2018/ciura/try.sh) script and the PDF file,
+[Cody](#cody) added the [try.sh](/2018/ciura/try.sh) and
+[try.alt.sh](/2018/ciura/try.alt.sh) scripts and the PDF file,
 [lexicon.pdf](/2018/ciura/lexicon.pdf), that was a dead link, restored from the
 Internet Wayback Machine.