Hi Abhishek,
In VSCode you are given a simple Hello World snippet and you can do this by using Shift + P > Al Go!
This will create app which prints a Hello World message when you open the Customer List page.
Either on your end you are not sure of the App which is installed on your BC.
Or you have removed the message code from you app.
You can simply follow this blog.
thinkaboutit.be/.../
If you are not understanding anything then let us know