feat: add CLI flags to app

- implement command-line flags for listen address and port
- add usage section to README

🤖

README.md

@@ -6,6 +6,10 @@ A pomodoro server written in Go
 
 `go install git.smsvc.net/pomodoro/GoTomato@latest`
 
+## Usage
+
+See `GoTomato --help` for Parameters
+
 ## Testing
 
 ```