add tools

tools/mkimg

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+RELEASE_FILE=$(pwd)/everest-distinfo
+if [ -f ${RELEASE_FILE} ]; then
+	source ${RELEASE_FILE}
+else
+	printf "${RELEASE_FILE} does not exist.\n"
+	exit 1
+fi
+
+tar Jcfv ${1}
+mv ${1}.tar.xz everestlinux-${VER}-${TARGET}-img.tar.xz