google gemini has entered the chat.

Created by: russellballestrini

modified:   README.rst
modified:   app.py

Summary by CodeRabbit

• New Features

  • Introduced new environment variables for API keys: GOOGLE_API_KEY and updated XAI_API_KEY.
  • Added commands for interacting with new Google Gemini models: gemini-flash, gemini-flash-8b, and gemini-pro.
  • Enhanced chat functionality to support interactions with the new AI models.

• Bug Fixes

  • Removed duplicate declaration of the XAI_API_KEY.

• Documentation

  • Updated README.rst to reflect new environment variables and commands.