how does this app run?

[modle]

$ ng serve
Local workspace file ('angular.json') could not be found.
Error: Local workspace file ('angular.json') could not be found.

[jlooper]

It's a NativeScript app, so you'd want to run it using tns run ios or tns run android with all the appropriate NativeScript installations completed. That said, it's a very old codebase so ymmv!