Add project files.

Caspian.WorkflowFramework.Package/Models/PublishEventModel.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using JetBrains.Annotations;
+
+namespace Caspian.WorkflowFramework.Models
+{
+    [PublicAPI]
+    public class PublishEventModel
+    {
+        [Required]
+        public string WorkflowInstanceId { get; set; }
+
+        [Required]
+        public string EventName { get; set; }
+
+        [Required]
+        public string? EventData { get; set; }
+    }
+}