Update README.md

Author: heshan-basnayaka

README.md

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 A-STEM: Advanced Storage Toolkit for Encryption and Migrations. [[https://ieeexplore.ieee.org/document/10417489](https://ieeexplore.ieee.org/document/10417489)]
 
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 ## Features
 
 - **Hybrid CPU-GPU Processing**: Automatically adjusts the workload between CPU and GPU based on system resource usage.