Update README.md

Author: pratiktech28

README.md

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-# 🔱 ASCN: Asynchronous Scalable Computing Node
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+[![A-scan Validation CI](https://github.com/pratiktech28/gprmax_Ascan/actions/workflows/main.yml/badge.svg)](https://github.com/pratiktech28/gprmax_Ascan/actions/workflows/main.yml)#  ASCN: Asynchronous Scalable Computing Node
 ### *Core Engine of the Trident Pipeline for gprMax*
 
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