Add semi-structured sparse tutorial

Author: jcaip

_static/img/pruning_flow.jpg

@@ -544,6 +544,13 @@ What's new in PyTorch tutorials?
    :link: advanced/static_quantization_tutorial.html
    :tags: Quantization
 
+.. customcarditem::
+   :header: (prototype) Accelerating BERT with semi-structured (2:4) sparsity
+   :card_description: Prune BERT to be 2:4 sparse and accelerate for inference.
+   :image: _static/img/thumbnails/cropped/generic-pytorch-logo.png
+   :link: prototype/semi_structured_sparse.html
+   :tags: Model-Optimziation 
+
 .. customcarditem::
    :header: Grokking PyTorch Intel CPU Performance from First Principles
    :card_description: A case study on the TorchServe inference framework optimized with Intel® Extension for PyTorch.