Add some usage

Author: raoulh

README.md

@@ -17,6 +17,44 @@ go get github.com/raoulh/moolticute-cli
 
 ```
 moolticute-cli --help
+
+Usage: moolticute-cli COMMAND [arg...]
+
+Command line tool to interact with a mooltipass device through a moolticute daemon
+
+Commands:
+  login        Manage credentials stored in the device
+  data         Import & export small files stored in the device
+  parameters   Get/Set device parameters
+
+Run 'moolticute-cli COMMAND --help' for more information on a command.
 ```
 
-> Warning! This project is a work in progress!
+```
+moolticute-cli login --help
+
+Usage: moolticute-cli login COMMAND [arg...]
+
+Manage credentials stored in the device
+
+Commands:
+  get          Get a password for given context
+  set          Add or update a context
+
+Run 'moolticute-cli login COMMAND --help' for more information on a command.
+```
+
+```
+moolticute-cli data --help                                                                                                               16:45:08  ✘ 2
+
+Usage: moolticute-cli data COMMAND [arg...]
+
+Import & export small files stored in the device
+
+Commands:
+  get          Retrieve data for given context
+  set          Add or update data for given context
+
+Run 'moolticute-cli data COMMAND --help' for more information on a command.
+```
+> Warning! This project is a work in progress!