Add script primes.sh to 1985/august for fun

The inspiration of the script is based on a 'try' command I added to the
README.md a while back to have more fun with the entry. The difference
is that it allows you to specify the number of lines to print (or up to
the number of lines).

There might be some misleading output in a way but this is a mystery for
users to solve.

1985/august/primes.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+
+make everything || exit 1
+
+PRIMES=$(type -P primes)
+
+COUNT=15
+if [[ "$#" -ge 1 ]]; then
+    COUNT="$1"
+    if ! [[ $COUNT =~ ^[0-9]+$ ]] ; then
+	echo "not a number: $COUNT" 1>&2	
+	exit 1
+    fi
+fi
+
+if [[ -n "$PRIMES" ]]; then
+    while read -r n ; do primes "$n" $((n + 1)) ; done < <((./august | head -n "$COUNT" ))
+else
+    echo "primes not installed" 1>&2
+    echo "See the following GitHub repo:" 1>&2
+    echo "" 1>&2
+    echo "	https://github.com/vattam/BSDGames"
+    exit 1
+fi