Update Readme

code/iottb-project/README.md

@@ -28,7 +28,28 @@ pyinstaller --onefile --name iottb --distpath ~/opt iottb/main.py
 to be able to run it as `iottb` if `~/opt' is a directory on your PATH.
 A executable which should be able to run on linux is included in the repo.
 ## Basic Invocation
+```bash
+Usage: iottb [OPTIONS] COMMAND [ARGS]...
 
+Options:
+  -v, --verbosity    Set verbosity  [default: 0; 0<=x<=3]
+  -d, --debug        Enable debug mode
+  --cfg-file PATH    Path to iottb config file  [default:
+                     /home/seb/.config/iottb/iottb.cfg]
+  --help             Show this message and exit.
+
+  --dry-run BOOLEAN  currently NOT USED!  [default: True]
+  
+Commands:
+  add-device           Add a device to a database
+  init-db
+  sniff                Sniff packets with tcpdump
+  
+Debugging Commands:
+  show-all             Show everything: configuration, databases, and...
+  show-cfg             Show the current configuration context
+```
+You can get the subcommand specif helptext by adding the `--help` option.
 ## Configuration
 ### Env Vars
 - IOTTB_CONF_HOME