Markdig prototype

- Issue MatterHackers/MCCentral#3660
Add Markdown implementation for help guides

Utilities/MarkdigAgg/AggCodeBlockRenderer.cs

@@ -0,0 +1,37 @@
+// Copyright (c) 2016-2017 Nicolas Musset. All rights reserved.
+// This file is licensed under the MIT license. 
+// See the LICENSE.md file in the project root for more information.
+
+using Markdig.Syntax;
+using MatterHackers.Agg;
+using MatterHackers.Agg.UI;
+using MatterHackers.MatterControl;
+
+namespace Markdig.Renderers.Agg
+{
+	public class CodeBlockX : FlowLayoutWidget
+	{
+		public CodeBlockX()
+		{
+			var theme = ApplicationController.Instance.Theme;
+			HAnchor = HAnchor.Stretch;
+			VAnchor = VAnchor.Fit;
+			Margin = 12;
+			Padding = 6;
+			BackgroundColor = theme.MinimalShade;
+		}
+	}
+
+	public class AggCodeBlockRenderer : AggObjectRenderer<CodeBlock>
+    {
+        protected override void Write(AggRenderer renderer, CodeBlock obj)
+        {
+            //var paragraph = new Paragraph();
+            //paragraph.SetResourceReference(FrameworkContentElement.StyleProperty, Styles.CodeBlockStyleKey);
+
+            renderer.Push(new CodeBlockX());
+            renderer.WriteLeafRawLines(obj);
+            renderer.Pop();
+        }
+    }
+}