Update README.md

README.md

-
 **_webdacacc_** is a Python 3 library providing tools to easy access webdav server.
 
 
@@ -25,4 +24,41 @@ Installation for Users
   $ git clone https://gitlab.in2p3.fr/jacquem/webdavacc.git
   $ cd webdavacc
   $ python setup.py install
-```
\ No newline at end of file
+```
+
+```sh
+Usage
+-----
+usage: webdavacc [-h] [-v] -u USERNAME -p PASSWORD [-a ARGUMENTS] [-t PORT]
+                 [-r PROTOCOL] -c COMMAND
+                 server
+
+positional arguments:
+  server
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -v, --verbose         increase output verbosity
+  -u USERNAME, --username USERNAME
+                        username
+  -p PASSWORD, --password PASSWORD
+                        password
+  -a ARGUMENTS, --arguments ARGUMENTS
+                        protocol
+  -t PORT, --port PORT  username
+  -r PROTOCOL, --protocol PROTOCOL
+                        protocol
+  -c COMMAND, --command COMMAND
+                        protocol
+
+Command arguments:
+   cd -a path
+   ls -a path=None
+   exists -a remote_path
+   mkdir -a path
+   mkdirs -a path
+   rmdir -a path
+   delete -a file_path
+   upload -a "local_path_or_fileobj  remote_path"
+   download -a "remote_path, local_path_or_fileobj"
+```