Added a new ipynb notebook to show the Gemini integration with LlamaIndex and Chroma

[dev-nid]

Description of the change

Added a new ipynb notebook to show the Gemini integration with LlamaIndex and Chroma

Motivation

Type of change

Other

Checklist

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

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[markmcd]

LGTM! I added a couple of small fixes:

• pin the llama-index version (resilience against API changes/breaks)
• clear pip install output
• and fix up the github link so it renders OK in nbreview.