Upload PaliGemma JAX tuning notebook

[joefernandez]

• for: ai.google.dev/gemma/docs/paligemma/fine-tuning-paligemma

Description of the change

Adding PaliGemma notebook for colab integration

Motivation

Integration with PallGemma docs page: https://ai.google.dev/gemma/docs/paligemma/fine-tuning-paligemma

Type of change

Choose one: Documentation | Other)

Checklist

• [x] I have performed a self-review of my code.
• [x] I have added detailed comments to my code where applicable.
• [x] I have verified that my change does not break existing code.
• [x] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [x] I am familiar with the Google Style Guide for the language I have coded in.
• [x] I have read through the Contributing Guide and signed the Contributor License Agreement.

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