docs(readme.md): updated README - Added Project Icon / Logo

Author: arijitcodes

README.md

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 # MicroStream Client SDK 🚀
 
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+   <img src="https://iamarijit.dev/img/projects/MicroStream-Icon.png" height="350"/>
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 The client library for Microstream, a lightweight, real-time communication library for microservices. Replace REST/gRPC with WebSockets for event-driven messaging. Simplifies inter-service communication with a request-response pattern and automatic reconnection.
 
 Author: [Arijit Banerjee](#author)