add argument options for xUnique

README.md

@@ -33,7 +33,11 @@ As you may know, the [`UUID`](http://www.ietf.org/rfc/rfc4122.txt) generated by
 4. In all your branches, uniquify `project.pbxproj` file in either way:
 	* make some changes and commit. Try to push, git hook would be triggered
 	* manually run script: `python path/to/xUnique.py path/to/MyProject.xcodeproj` and then committing changes.
-5. All Done;) 
+5. If you want to use part of xUnique functions, use below options in arguments:
+    * `-v`: print verbose output
+    * `-u`: uniquify project file, that is, replace UUID to MD5 digest
+    * `-s`: sort project file inlcuding `children` list, `files` list, `PBXFileReference` list and `PBXBuildFile`
+    * if neither `-u` nor `-s` exists, execute both uniquify and sort
 
 ### Examples
 ------------

xUnique.py

@@ -388,7 +388,7 @@ def __unique_build_file(self, parent_hex, build_file_hex):
 
 
 def main(sys_args):
-    usage = "usage: %prog [[-u|--unique]|[-s|--sort (24|32)]] path/to/Project.xcodeproj"
+    usage = "usage: %prog [-v|-verbose][-u|--unique][-s|--sort] path/to/Project.xcodeproj"
     description = "By default, without any option, xUnique uniquify and sort the project file."
     parser = OptionParser(usage=usage, description=description)
     parser.add_option("-v", "--verbose",