Don't limit tables and grids to markup text

Closes #13

src/Spectre.Console/Rendering/Markup.cs

@@ -0,0 +1,43 @@
+using System.Collections.Generic;
+using Spectre.Console.Internal;
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// A renderable piece of markup text.
+    /// </summary>
+    public sealed class Markup : Renderable, IAlignable
+    {
+        private readonly Text _text;
+
+        /// <inheritdoc/>
+        public Justify? Alignment
+        {
+            get => _text.Alignment;
+            set => _text.Alignment = value;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Markup"/> class.
+        /// </summary>
+        /// <param name="text">The markup text.</param>
+        /// <param name="style">The style of the text.</param>
+        public Markup(string text, Style? style = null)
+        {
+            _text = MarkupParser.Parse(text, style);
+        }
+
+        /// <inheritdoc/>
+        protected override Measurement Measure(RenderContext context, int maxWidth)
+        {
+            return ((IRenderable)_text).Measure(context, maxWidth);
+        }
+
+        /// <inheritdoc/>
+        protected override IEnumerable<Segment> Render(RenderContext context, int maxWidth)
+        {
+            return ((IRenderable)_text).Render(context, maxWidth);
+        }
+    }
+}