Configure project for NuGet packaging and implement WithData for chainable ViewData updates

DigitalData.Core.API/ControllerExtensions.cs

@@ -0,0 +1,26 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace DigitalData.Core.API
+{
+    /// <summary>
+    /// Provides extension methods for controllers in ASP.NET Core applications.
+    /// This class is designed to enhance the functionality of <see cref="Controller"/>, <see cref="ControllerBase"/>,
+    /// and their related results such as <see cref="ViewResult"/>.
+    /// </summary>
+    public static class ControllerExtensions
+    {
+        /// <summary>
+        /// Adds or updates a value in the ViewData dictionary of a ViewResult. This method supports fluent chaining, 
+        /// enabling cleaner and more readable modifications to ViewData.
+        /// </summary>
+        /// <param name="viewResult">The ViewResult to which ViewData will be added or updated.</param>
+        /// <param name="index">The key in the ViewData dictionary where the value will be stored.</param>
+        /// <param name="value">The value to be stored in the ViewData dictionary.</param>
+        /// <returns>The same ViewResult object with updated ViewData, allowing for additional chained operations.</returns>
+        public static ViewResult WithData(this ViewResult viewResult, string index, object value)
+        {
+            viewResult.ViewData[index] = value;
+            return viewResult;
+        }
+    }
+}