add metadata

Author: v-thepet

docs/msbuild/msbuild-api.md

@@ -1,3 +1,15 @@
+---
+title: "MSBuild API | Microsoft Docs"
+ms.custom: ""
+ms.date: "11/04/2016"
+ms.technology: msbuild
+ms.topic: "conceptual"
+author: mikejo5000
+ms.author: mikejo
+manager: douge
+ms.workload: 
+  - "multiple"
+---
 # Use the MSBuild API
 
 MSBuild provides a public API surface so that your program can perform builds and inspect projects.