Update README.md

README.md

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 # cert400
 
-CA Web-Server written in Go capable of generating signed certificates
+CA Web-Server written in Go capable of generating signed TLS certificates
+
+## Usage
+```
+cert400 [command]
+
+Available Commands:
+  completion  Generate the autocompletion script for the specified shell
+  generate-ca Generate CA certificates for the webserver to use
+  help        Help about any command
+  server      Start cert400 web server
+
+Flags:
+      --config string   Config file (default is $HOME/.config/cert400/cert400.toml)
+  -h, --help            help for cert400
+
+Use "cert400 [command] --help" for more information about a command.
+```