Potential translation in French

[ncs-pl]

Hello,

I plan to provide a translation of the Rust By Example book in French for merging in this repository as the previous translation by @Songbird0 has been archived for two years.

Before proceeding, I wanted to make sure it is ok to add a new translation in this project.

I remain at your disposal for more information.

[ncs-pl]

For those interested, I started in my fork.