Add Farsi Datasets to train base LLM

[pourmand1376]

I add these datasets since the model doesn't seem to understand standard persian.

• Supporting new language #2974

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[olliestanley]

The README will need a bit more of a description of what each dataset is, how it can be loaded, and how it can be used/what it is intended for (e.g. pretraining, instruction tuning)

[pourmand1376]

Okay, I have read this tutorial and I will submit another pull request with open-assistant standards.