Add chapters 10 & 11

[lbourdois]

Hi!

Here are the French notebooks for chapter 10 of the NLP course.

The PR adding chapter 10 is available here : https://github.com/huggingface/course/pull/517.

If @nataliaElv (or maybe @lewtun if you still manage the course) can review this PR, I would be grateful 🤗

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[lbourdois]

Update: add French notebooks for chapter 11 of the NLP course.

The PR adding chapter 11 is available here : https://github.com/huggingface/course/pull/517.

@burtenshaw who wrote chapter 11 is probably the most qualified to review