Add Microsoft Copilot

[PierreMesure]

This PR adds two documents for Microsoft Copilot:

• the Terms of service
• the Privacy statement.

It's a response to #121.

[PierreMesure]

Thank you Clément, changes approved.

[PierreMesure]

It got a bit messy with the added comma. If you want, I could squash the commits and make it cleaner but I won't do it tonight, it's too late.