Fix incorrect installation instructions (for issue #37476)
Author: Zephyr271828
Pull request: yes
Labels: name: Flax

# What does this PR do?

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This PR is a proposed solution for issue #37476. Specifically, this PR modifies description in README.md, adds a requirements.txt file and an install.sh file:
- README.md: change python version requirement from 3.9+ to 3.9-3.12; add feasible installation commands. These changes will also fix the [transformers pypi page](https://pypi.org/project/transformers/).
```py
# venv
python -m venv .my-env
source .my-env/bin/activate
pip install "jax>=0.4.1,<=0.4.13"
pip install "optax>=0.0.8,<=0.1.4"
pip install "orbax-checkpoint==0.2.3"
pip install "torch>=2.1"
pip install "tensorflow>2.9,<2.16"
pip install "flax>=0.4.1,<=0.7.0"
pip install "accelerate>=0.26.0"
```
- requirements.txt: listing the core requirements of the package as specified in [setup.py](https://github.com/huggingface/transformers/blob/6daa3eeba582facb57cd71db8efb66998b12942f/setup.py#L436). Note more variants of requirements.txt should be added, but I'm not sure how to do it. I would be grateful if you could give me some suggestions!
- install.sh: a script that verifies python version, creates the virtual env, installs the core packages, and validates the installation with the [quickstart example](https://github.com/huggingface/transformers?tab=readme-ov-file#quickstart). The script closely follows the version requiremetns in setup.py, and has been tested and worked on my machine. If you encounter any bugs, please tell me so that I can fix accordingly.


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Comments:
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> Hi @Zephyr271828, I'm sorry for being late with this one, but I don't think we can accept this PR as-is, but we could accept some of the changes from it! I should have said something earlier, but there are a few issues:
> 
> * We don't want to limit our Python version compatibility to remain compatible with Tensorflow. Right now our TF/JAX support is mostly in maintenance mode, and PyTorch is the primary framework of the library!
> * We don't want to add a separate `install.sh` script, especially since we don't need the Py<3.13 version check!
> 
> However, some of the changes here are useful, and we could keep them! I'll flag them in the comments.

Hi Matt @Rocketknight1 these suggestions totally make sense to me! I have submitted a new version of PR and would be happy if you could check if it's ready for merge:)

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_37640). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.