Translate README.md to French

[kapiper]

Checklist

• [X] I have looked into the Readme, Examples, and FAQ and have not found a suitable solution or answer.
• [X] I have looked into the API documentation and have not found a suitable solution or answer.
• [X] I have searched the issues and have not found a suitable solution or answer.
• [X] I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• [X] I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

It would be helpful to have a copy of the README in French so French speakers can better understand this project and contribute.

Describe the ideal solution

A French translation of the README would be the ideal solution.

Alternatives and current workarounds

No response

Additional context

No response