Add Model Selection for User Input

[adityaghai07]

Description:
Allow users to select which model (e.g., llmware models ,OpenAI, Claude, Gemini) while using the project.

Objectives:

• Implement a user input parameter to specify the desired model.
• Allow seamless switching between models without affecting the overall functionality.
• Provide a default model if no selection is made by the user.

Benefits:

• Flexibility for users to choose the most suitable model for their tasks.
• Easier experimentation with different AI models.

Requirements:

• Implement input parameter for model selection.
• Ensure smooth model switching with no impact on core functionality.
• Update documentation to reflect model selection process.