Add initial cleanup script

cleanup.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+DIRECTORY=$1
+EXTENSION=$2
+
+# delete all files in given directory with given extension with size 0
+# could be shorter but this one is easy to read ;-)
+
+find $DIRECTORY -maxdepth 1 -name "*.$EXTENSION" -type f -print0 | while read -d $'\0' file
+do
+    if [ $(stat -c%s "$file") -eq 0 ]
+    then
+        rm -f "$file"
+    fi
+done