docs: adding link to obj detect. studio (#20150)

README.md

@@ -138,6 +138,7 @@ Explore various types of training possible with PyTorch Lightning. Pretrain and
 | [Hello world](#hello-simple-model) | Pretrain - Hello world example | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/pytorch-lightning-hello-world"><img src="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/app-2/studio-badge.svg" alt="Open In Studio"/></a> |
 | [Image classification](https://lightning.ai/lightning-ai/studios/image-classification-with-pytorch-lightning) | Finetune - ResNet-34 model to classify images of cars | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/image-classification-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 segmentation](https://lightning.ai/lightning-ai/studios/image-segmentation-with-pytorch-lightning) | Finetune - ResNet-50 model to segment images | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/image-segmentation-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> | 
+| [Object detection](https://lightning.ai/lightning-ai/studios/object-detection-with-pytorch-lightning) | Finetune - Faster R-CNN model to detect objects | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/object-detection-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> |
 | [Text classification](https://lightning.ai/lightning-ai/studios/text-classification-with-pytorch-lightning) | Finetune - text classifier (BERT model) | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/text-classification-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> | 
 | [Text summarization](https://lightning.ai/lightning-ai/studios/text-summarization-with-pytorch-lightning) | Finetune - text summarization (Hugging Face transformer model) | <a target="_blank" href="https://lightning.ai/lightning-ai/studios/text-summarization-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> | 
 | [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> |