Update README.md (#93)

Author: cb-sriramthiagarajan

README.md

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 # Chargebee Python Client Library v3
 
+> [!NOTE]
+> [![Join Discord](https://img.shields.io/badge/Discord-Early%20Access-blue?logo=discord&logoColor=white)](https://discord.gg/S3SXDzXHAg)
+>
+> We are trialing a Discord server for developers building with Chargebee. Limited spots are open on a first-come basis. Join [here](https://discord.gg/S3SXDzXHAg) if interested.
+
+
 This is the official Python library for integrating with Chargebee.
 - 📘 For a complete reference of available APIs, check out our [API Documentation](https://apidocs.chargebee.com/docs/api/?lang=python).  
 - 🧪 To explore and test API capabilities interactively, head over to our [API Explorer](https://api-explorer.chargebee.com).