add 5 together llama notebooks (#798)

recipes/3p_integrations/togetherai/images/simple_RAG.png

..._integrations/togetherai/images/structured_text_image.png

recipes/3p_integrations/togetherai/images/summarization.png

recipes/3p_integrations/togetherai/images/summary_task.png

recipes/3p_integrations/togetherai/images/text_RAG.png

recipes/3p_integrations/togetherai/images/together-color.jpg

recipes/3p_integrations/togetherai/images/together.gif

recipes/3p_integrations/togetherai/images/wandb_model.png

...togetherai/knowledge_graphs_with_structured_outputs.ipynb

...pes/3p_integrations/togetherai/llama_contextual_RAG.ipynb

...erai/multimodal_RAG_with_nvidia_investor_slide_deck.ipynb

...s/togetherai/structured_text_extraction_from_images.ipynb

...rations/togetherai/text_RAG_using_llama_on_together.ipynb