Update README.md

Added model description.

README.md

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-license: llama2
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+# GBLM-Pruner-LLaMA-2-7B-Chat Model Card
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+## Model details
+
+**Model type:**
+GBLM-Pruner-LLaMA-2-7B-Chat is an open-source compressed model obtained by unstructured pruning of 50 percent of the weights of the LLaMA-2-7B-Chat model. 
+
+## License
+GBLM-Pruner-LLaMA-2-7B-Chat is licensed under the LLAMA 2 Community License, Copyright (c) Meta Platforms, Inc. All Rights Reserved.
+
+**Where to send questions or comments about the model:**
+https://github.com/RocktimJyotiDas/GBLM-Pruner/issues