add branch config support

README.md

@@ -1,11 +1,19 @@
 # expect script for chromium init repo.
-This script is inteted to deploy for daily build chromium OS
+This script is intented to deploy for daily build chromium OS
+- build chroimum OS
+- build firmware 
+- copy local manifest file
+- copy common utility to {chromium}/src/scrips directory 
 
 # usage 
 ```
 # parameter is deprecated, please setup the user_passwork and repo_directory in config.txt
-$ ./main_cros_reposync_build.sh"
+$ ./main_cros_reposync_build.sh
 ```
 
+# chromium repo branch support
+- main
+- firmware-volteer-13672.B
+
 # todo 
 1. add branch support