I started a new Spring boot project, I want to change the port number and I read that I have to modify the `/resource/application.properties` to do so. 

I cannot locate this file however, did I miss something? Do I need to install a boot starter? I don't want to set this using the spring CLI. 

Should I create this file manually? If so, I think I'll have to mark this file as the properties file somewhere in the code. Where would that be?

Thanks a lot!