Added license. Cleanup and expanded documentation.

main.go

@@ -52,9 +52,9 @@ func main() {
 	}()
 
 	// Wait for interrupt signal to gracefully shutdown the server with a timeout of 10 seconds.
-	// Use a buffered channel to avoid missing signals as recommended for signal.Notify
 	quit := make(chan os.Signal, 1)
 	signal.Notify(quit, os.Interrupt)
+	signal.Notify(quit, os.Kill)
 	<-quit
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()