Prepare repository for the v3 next release.

[Ceeb182]

I didn't forget to respect contributing rules !

• [ ] Correction
• [ ] New drawing
• [ ] New Literal translation
• [ ] Translation from an existing SVG file
• [ ] New news for Plus and Unpublished version
• [x] Other...

Message : Prepare repository for the v3 next release.

• Release note
• Readme files

[Ceeb182]

Done