Add scan command

cmd/wire_injectors.go

@@ -27,6 +27,12 @@ func CreateServer(musicFolder string) *server.Server {
 	))
 }
 
+func CreateScanner(musicFolder string) *scanner.Scanner {
+	panic(wire.Build(
+		allProviders,
+	))
+}
+
 func CreateAppRouter() *app.Router {
 	panic(wire.Build(allProviders))
 }