first commit

Kafka.Lib/IMessageType.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Kafka.Lib;
+
+public interface IMessageType
+{
+    public string? Id { get; set; }
+    public string? EventType { get; }
+    
+    [JsonIgnore]
+    public string Text { get; }
+}