cookiecutter template for adding flax model
# 🚀 Feature request

Add cookiecutter template for adding flax model.

## Motivation

There is no cookiecutter template for adding flax model.

## Your contribution

I am trying to add a flax model (#12411), I think it's a good opportunity to create a template at the same time. Can I work on this? Any suggestions?

@patil-suraj @patrickvonplaten 

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