Updated README to include sparsity-exp

Author: alokpathy

README.md

@@ -1,6 +1,9 @@
 # CAGNET: Communication-Avoiding Graph Neural nETworks
 
-This branch contains implementations for CAGNET's full-batch training pipeline (SC'20). For CAGNET's minibatch training pipeline (MLSys'24), please refer to the `distributed-sampling` branch.
+This branch contains implementations for CAGNET's full-batch training pipeline (SC'20). 
+
+For CAGNET's minibatch training pipeline (MLSys'24), please refer to the `distributed-sampling` branch.
+For CAGNET's sparsity-aware pipeline (ICPP'24), please refer to the `sparsity-exp` branch.
 
 ## Description