Add project files.

Nodify/Nodes/Events/ResizeEventArgs.cs

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+using System;
+using System.Windows;
+
+namespace Nodify.Events
+{
+    /// <summary>
+    /// Represents the method that will handle resize related routed events.
+    /// </summary>
+    /// <param name="sender">The sender of this event.</param>
+    /// <param name="e">The event data.</param>
+    public delegate void ResizeEventHandler(object sender, ResizeEventArgs e);
+
+    /// <summary>
+    /// Provides data for resize related routed events.
+    /// </summary>
+    public class ResizeEventArgs : RoutedEventArgs
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ResizeEventArgs"/> class with the previous and the new <see cref="Size"/>.
+        /// </summary>
+        /// <param name="previousSize">The previous size associated with this event.</param>
+        /// <param name="newSize">The new size associated with this event.</param>
+        public ResizeEventArgs(Size previousSize, Size newSize)
+        {
+            PreviousSize = previousSize;
+            NewSize = newSize;
+        }
+
+        /// <summary>
+        /// Gets the previous size of the object.
+        /// </summary>
+        public Size PreviousSize { get; }
+
+        
+        /// <summary>
+        /// Gets the new size of the object.
+        /// </summary>
+        public Size NewSize { get; }
+
+        protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget)
+            => ((ResizeEventHandler)genericHandler)(genericTarget, this);
+    }
+}