docs: adding link to recommendation studio (Lightning-AI#20197)

* docs: adding link to recommendation studio

* line

Author: Borda

README.md

@@ -209,6 +209,7 @@ Explore various types of training possible with PyTorch Lightning. Pretrain and
 | [Audio generation](https://lightning.ai/lightning-ai/studios/finetune-a-personal-ai-music-generator)        | Finetune - audio generator (transformer model)                 | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/finetune-a-personal-ai-music-generator"><img src="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/app-2/studio-badge.svg" alt="Open In Studio"/></a> |   
 | [LLM finetuning](https://lightning.ai/lightning-ai/studios/finetune-an-llm-with-pytorch-lightning)          | Finetune - LLM (Meta Llama 3.1 8B)                | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/finetune-an-llm-with-pytorch-lightning"><img src="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/app-2/studio-badge.svg" alt="Open In Studio"/></a> | 
 | [Image generation](https://lightning.ai/lightning-ai/studios/train-a-diffusion-model-with-pytorch-lightning)          | Pretrain - Image generator (diffusion model)                | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/train-a-diffusion-model-with-pytorch-lightning"><img src="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/app-2/studio-badge.svg" alt="Open In Studio"/></a> | 
+| [Recommendation system](https://lightning.ai/lightning-ai/studios/recommendation-system-with-pytorch-lightning)  | Train - recommendation system (factorization and embedding)    | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/recommendation-system-with-pytorch-lightning"><img src="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/app-2/studio-badge.svg" alt="Open In Studio"/></a> | 
 | [Time-series forecasting](https://lightning.ai/lightning-ai/studios/time-series-forecasting-with-pytorch-lightning) | Train - Time-series forecasting with LSTM               | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/time-series-forecasting-with-pytorch-lightning"><img src="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/app-2/studio-badge.svg" alt="Open In Studio"/></a> | 
 
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