Clean up status related code a bit

src/Spectre.Console/Extensions/Progress/ProgressTaskExtensions.cs

@@ -0,0 +1,44 @@
+using System;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="ProgressTask"/>.
+    /// </summary>
+    public static class ProgressTaskExtensions
+    {
+        /// <summary>
+        /// Sets the task description.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        /// <param name="description">The description.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static ProgressTask Description(this ProgressTask task, string description)
+        {
+            if (task is null)
+            {
+                throw new ArgumentNullException(nameof(task));
+            }
+
+            task.Description = description;
+            return task;
+        }
+
+        /// <summary>
+        /// Sets the max value of the task.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        /// <param name="value">The max value.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static ProgressTask MaxValue(this ProgressTask task, double value)
+        {
+            if (task is null)
+            {
+                throw new ArgumentNullException(nameof(task));
+            }
+
+            task.MaxValue = value;
+            return task;
+        }
+    }
+}