Add command line help output

README.md

@@ -26,6 +26,28 @@ A webdav server is also exposed to your localhost via port `9999`.
 
 ### Note: when using zurg in a server outside of your home network, ensure that "Use my Remote Traffic automatically when needed" is unchecked on your [Account page](https://real-debrid.com/account)
 
+## Command-line utility
+
+```
+Usage:
+  zurg [flags]
+  zurg [command]
+
+Available Commands:
+  clear-downloads Clear all downloads (unrestricted links) in your account
+  clear-torrents  Clear all torrents in your account
+  completion      Generate the autocompletion script for the specified shell
+  help            Help about any command
+  network-test    Run a network test
+  version         Prints zurg's current version
+
+Flags:
+  -c, --config string   config file path (default "./config.yml")
+  -h, --help            help for zurg
+
+Use "zurg [command] --help" for more information about a command.
+```
+
 ## Why zurg? Why not X?
 
 - Better performance than anything out there; changes in your library appear instantly ([assuming Plex picks it up fast enough](./plex_update.sh))