Update arxiv URL

README.md

@@ -12,7 +12,7 @@ Optimizer is a python package that provides:
 
 ## Currently implemented
 - Parallel Muon with N-D sharding
-  - arxiv URL: (TBW)
+  - [arxiv URL](https://arxiv.org/abs/2511.07464)
   - Supports **general N-D sharding configurations**
     - The implementation is not tied to any specific parallel strategy.
     - Verified from basic FSDP2 setups up to hybrid configurations such as