repeat clone request https://github.com/ioccc-src/winner/pull/20

Added .DS_Store, prog and alt.prog.

Fixed typo in robots.txt.

.gitignore

@@ -0,0 +1,3 @@
+.DS_Store
+prog
+alt.prog

robots.txt

@@ -1,8 +1,8 @@
 # If you are an official mirror you know what the user agent field should be!
 # If you want to be an ioccc mirror contact <mirror-request@ioccc.org>.  You
-# must include IOCCC 2013 in the subject line or your email will bounce.
+# must include IOCCC 2023 in the subject line or your email will bounce.
 
-# Added due to slurping up everthing as fast as it could
+# Added due to slurping up everything as fast as it could
 User-agent: sistrix
 Disallow: /