add pst script for internal pastebin

bin/pst

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -eo pipefail
+
+URL="https://paste.aarn.shelman.io"
+
+FILEPATH="$1"
+FILENAME=$(basename -- "$FILEPATH")
+EXTENSION="${FILENAME##*.}"
+
+RESPONSE=$(curl -s --data-binary "@${FILEPATH:-/dev/stdin}" --url $URL)
+PASTELINK="$URL$RESPONSE"
+
+[ -z "$EXTENSION" ] &&
+	echo "$PASTELINK" ||
+	echo "$PASTELINK.$EXTENSION"