Add Razor TagHelper for Ooui

You can now use <ooui element="button"/> to embed Ooui in Razor pages.

Fixes #63

Ooui.AspNetCore/TagHelpers/OouiTagHelper.cs

@@ -0,0 +1,16 @@
+using Microsoft.AspNetCore.Razor.TagHelpers;
+
+namespace Ooui.AspNetCore.TagHelpers
+{
+    public class OouiTagHelper : TagHelper
+    {
+        public Ooui.Element Element { get; set; }
+
+        public override void Process (TagHelperContext context, TagHelperOutput output)
+        {
+            output.TagName = "div";
+            output.TagMode = TagMode.StartTagAndEndTag;
+            output.Content.SetHtmlContent (Element.OuterHtml);
+        }
+    }
+}

PlatformSamples/AspNetCoreMvc/Views/Shared/_Layout.cshtml

@@ -41,6 +41,9 @@
         <hr />
         <footer>
             <p>&copy; 2017 - @DateTime.UtcNow.Year Frank A. Krueger</p>
+            @{ var e = new Ooui.Sa.Button("Hello World"); }
+            <ooui element="e" />
+            <!--Html.Ooui (e)-->
         </footer>
     </div>
 

PlatformSamples/AspNetCoreMvc/Views/_ViewImports.cshtml

@@ -2,3 +2,4 @@
 @using AspNetCoreMvc.Models
 @using AspNetCoreMvc.Controllers
 @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
+@addTagHelper *, Ooui.AspNetCore