So as to launch our project, you must launch both the app and the API. You can do so by defining them both as new starting projects.
Go to Visual Studio -> Click right on the solution -> Click on definig new starting projects -> Select both the app and the API -> Save these settings -> That's it !
Go to Visual Studio -> Right click on the solution -> Click on definig new starting projects -> Select both the app and the API -> Save these settings -> That's it !