add landing page for reference

Author: chenkennt

.gitignore

@@ -205,4 +205,5 @@ project.lock.json
 samples/WebApplication1/src/WebApplication1/wwwroot/lib/
 
 _site/
-api/
+api/*.yml
+api/.manifest

api/reference.md

@@ -0,0 +1,12 @@
+---
+_tocPath: api/toc.html
+_tocRel: toc.html
+_navPath: toc.html
+_navRel: ../toc.html
+---
+
+# 🔧 .NET Core API Reference
+
+> **Note**
+> 
+> This topic hasn’t been written yet! You can track the status of this issue through our public GitHub issue tracker. Learn how you can contribute on GitHub.

api/toc.yml

@@ -0,0 +1 @@
+- name: TOC not Available on Local Preview

docfx.json

@@ -22,7 +22,7 @@
         {
           "files": [
             "docs/**/*.md",
-            "**/index.md"
+            "api/*.md"
           ]
         },
         {

exclude.list

@@ -1,4 +1,3 @@
 _site\index.html
 _site\styles\coreclr\coreclr.css
 _site\images
-.mta.json

toc.yml

@@ -5,7 +5,7 @@
 - name: Documentation
   href: docs/
 - name: API reference
-  href: http://dotnet.github.io/dotnet-web/api/System.html
-  homepage: api/System.yml
+  href: api/
+  homepage: api/reference.md
 - name: Support
   href: http://dotnet.github.io/dotnet-web/support/index.html