Add project files.

Examples/Nodify.Calculator/Models/SaveGraphModel.cs

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+using Microsoft.CodeAnalysis;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Nodify.Calculator.Models
+{
+    public class SaveGraphModel
+    {
+        public string Name { get; set; }
+        
+        public List<SaveNodes> Nodes { get; set; } = new List<SaveNodes>();
+    }
+
+    public class SaveNodes
+    {
+        public Point Location { get; set; }
+    }
+}

Examples/Nodify.Calculator/Models/SwaggerNodeModel.cs

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+using System.Collections.Generic;
+
+namespace Nodify.Calculator.Models
+{
+    public class SwaggerNodeModel
+    {
+        public int Id { get; set; }
+        public string Title { get; set; } = string.Empty;
+        public string OPType { get; set; } = string.Empty;
+        public List<string> InputNames { get; set; } = new List<string>();
+        public string SwaggerFileName { get; set; } = string.Empty;
+    }
+}

Examples/Nodify.Calculator/Models/VariableModel.cs

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+using System.Collections.Generic;
+
+namespace Nodify.Calculator.Models
+{
+    public class VariableModel
+    {
+        public int Id { get; set; }
+        public string Name { get; set; } = string.Empty;
+        public string VariableType { get; set; } = "string";
+        public string DefaultValue { get; set; } = string.Empty;
+    }
+}