Create modeling_ngen3.py for NGen3
Author: Thishyaketh
Pull request: yes

# What does this PR do?

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Fixes # (issue)


## Before submitting
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## Who can review?

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Models:

- text models: @ArthurZucker
- vision models: @amyeroberts, @qubvel
- speech models: @eustlb
- graph models: @clefourrier

Library:

- flax: @gante and @Rocketknight1
- generate: @zucchini-nlp (visual-language models) or @gante (all others)
- pipelines: @Rocketknight1
- tensorflow: @gante and @Rocketknight1
- tokenizers: @ArthurZucker
- trainer: @muellerzr and @SunMarc
- chat templates: @Rocketknight1

Integrations:

- deepspeed: HF Trainer/Accelerate: @muellerzr
- ray/raytune: @richardliaw, @amogkam
- Big Model Inference: @SunMarc
- quantization (bitsandbytes, autogpt): @SunMarc @MekkCyber

Documentation: @stevhliu

HF projects:

- accelerate: [different repo](https://github.com/huggingface/accelerate)
- datasets: [different repo](https://github.com/huggingface/datasets)
- diffusers: [different repo](https://github.com/huggingface/diffusers)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Maintained examples (not research project or legacy):

- Flax: @Rocketknight1
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Comments:
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Pull Request for NGen3CasualLM modeling_ngen3.py

Hi 👋, thank you for opening this pull request! The pull request is converted to draft by default. When it is ready for review, please click the `Ready for review` button (at the bottom of the PR page).

Hi @Thishyaketh, unfortunately adding a model requires more than just a modeling file! Take a look at the recent [Mistral3](https://github.com/huggingface/transformers/pull/36790) PR for an example

Hey! having a bit more context will help, recommending you to follow https://huggingface.co/docs/transformers/en/add_new_model 

Hi @ArthurZucker and @Rocketknight1 It's my first time I pushed models to huggingface transformers, as I am a 14 Yr old I built the models from scratch and had no experience in pushing to transformers neither guidance so, It might be incorrect by the way Thanks for your Guidance. 🙏

Highly recommend you to put the model on the hub following https://huggingface.co/docs/transformers/en/model_sharing ! should be a lot easier 🤗 

@ArthurZucker sir Can I have you Email because I think I need a bit help if could help me out it would be great 🙏