Update guide to setup the GitHub repository

[MGaetan89]

Pull request

Description

This PR updates the readme to provide sample code for both cases to setup GitHub Packages repository: either in the root build.gradle or in the settings.gradle file.
It also make it clear that library desugaring should be enable even if the min SDK version is 24+.

Changes made

• Self-explanatory.

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[github-actions]

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