add arguments to support customized working dir

README.md

@@ -1,5 +1,11 @@
 # expect script for chromium init repo.
 This script is inteted to deploy for daily build chromium OS
 
-Working directory is hard coding in `~/chrome/`.
-So please make sure you clone this repo into `~/chrome` directory.
+# usage 
+```
+$ ./main_cros_reposync_build.sh [user_password] [working_directory]"
+```
+
+# todo 
+1. add branch support
+2. judge the working path, only remove last string if space