Add clean script

Author: HillLiu

clean.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+find ./vendor -type d | xargs rm -rf
+find ./.git -type d | xargs rm -rf
+find ./demo -type d | xargs rm -rf
+find ./composer.lock | xargs rm -rf
+find ./clean.sh | xargs rm -rf