add cosine gamma schedule example

Author: xywei00

README.md

@@ -118,6 +118,7 @@ Tutorials
   - [Optimizing multi-label AUROC loss on Chest X-Ray dataset (CheXpert)](https://github.com/Optimization-AI/LibAUC/blob/main/examples/07_Optimizing_Multi_Label_AUROC_Loss_with_DenseNet121_on_CheXpert.ipynb)
   - [Optimizing AUROC loss on Tabular dataset (Credit Fraud)](https://github.com/Optimization-AI/LibAUC/blob/main/examples/12_Optimizing_AUROC_Loss_on_Tabular_Data.ipynb)
   - [Optimizing AUROC loss for Federated Learning](https://github.com/Optimization-AI/LibAUC/blob/main/examples/scripts/06_Optimizing_AUROC_loss_with_DenseNet121_on_CIFAR100_in_Federated_Setting_CODASCA.py)
+  - [Optimizing GCLoss (Bimodal with Cosine Gamma)](https://docs.libauc.org/examples/sogclr_gamma.html)
 
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