ollamar 1.2.1

• generate() and chat() accept multiple images as prompts/messages.
• Add functions to validate messages for chat() function: validate_message(), validate_messages().
• Add encode_images_in_messages() to encode images in messages for chat() function.
• Add create_messages() to create messages easily.
• Helper functions for managing messages accept ... parameter to pass additional options.
• Update README and docs to reflect changes.