Update README.md

Signed-off-by: greenie-msft <[email protected]>

Author: greenie-msft

README.md

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 name: Microservice communication using pubsub (async)(Node.js)
 description: Create a publisher microservice and a subscriber microservice with Node.js to demonstrate how Dapr enables a publish-subcribe pattern. The publisher will generate messages of a specific topic, while subscribers will listen for messages of specific topics. 
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 # Microservice communication using pubsub (async)