Help me to add NLLB

[Mukhammadsaid19]

Model description

No Language Left Behind (NLLB) is a first-of-its-kind, AI breakthrough project that open-sources models capable of delivering evaluated, high-quality translations directly between 200 languages—including low-resource languages like Asturian, Luganda, Urdu and more. It aims to give people the opportunity to access and share web content in their native language, and communicate with anyone, anywhere, regardless of their language preferences.

Open source status

• The model implementation is available
• The model weights are available

Provide useful links for the implementation

I know differences of NLLB (M2M_100) architecture from other Seq2Seq models; however, it would be nice to know what is the main recipe for adding such models to this library.

[github-actions]

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