Add Kafka Core to Third-Party Libraries (#2361)

* Add Kafka Core to 3rd party libraries.

Author: ffernandolima

3RD_PARTY.md

@@ -10,3 +10,4 @@ To add your project, open a pull request!
 - [Multi Schema Avro Deserializer](https://github.com/ycherkes/multi-schema-avro-desrializer) - Avro deserializer for reading messages serialized with multiple schemas.
 - [OpenSleigh.Transport.Kafka](https://github.com/mizrael/OpenSleigh/tree/develop/src/OpenSleigh.Transport.Kafka) - A Kafka Transport for OpenSleigh, a distributed saga management library.
 - [SlimMessageBus.Host.Kafka](https://github.com/zarusz/SlimMessageBus) - Apache Kafka transport for SlimMessageBus (lightweight message bus for .NET)
+- [Kafka Core](https://github.com/ffernandolima/confluent-kafka-core-dotnet) - Kafka Core empowers developers to build robust .NET applications on top of Confluent Kafka, focusing on simplicity, maintainability, and extensibility with intuitive abstractions and builders.