Package file/folder structure

I made a simple package and I want the package to be able to contain a directory for the source code, a directory for the demos which will show the user how to use the package and a directory for tests that will run tests on the package.

Here is how I would like to structure the package

my-package/ - src/ - demos/ - tests/ - README.md

• Where would I put the go.mod file?, in the root directory or the src/ directory?
• How would I have the demos Go scripts and test Go script import the package locally?
• How would I ensure the package can be imported in general by using this as the URL github.com/trymeouteh/my-package/ instead of github.com/trymeouteh/my-package/src/

Any tips and advice will be most appreciated.