Add project files.

Caspian.WorkflowFramework.Package/Models/CreateAndExecuteWorkflowModel.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Elsa.Common.Models;
+using JetBrains.Annotations;
+
+namespace Caspian.WorkflowFramework.Models
+{
+    [PublicAPI]
+    public class CreateAndExecuteWorkflowModel
+    {
+        /// <summary>
+        /// Workflow name
+        /// </summary>
+        [Required]
+        public string? Name { get; set; }
+
+        /// <summary>
+        /// Workflow version
+        /// </summary>
+        [Required]
+        public VersionOptions Version { get; set; }
+
+        /// <summary>
+        /// Current user's id
+        /// </summary>
+        [Required]
+        public long? UserId { get; set; }
+    }
+}