Updated sample YAML description

samples/react-aad-webapi/README.md

@@ -1,3 +1,18 @@
+---
+page_type: sample
+products:
+- office-sp
+languages:
+- javascript
+- aspx
+- csharp
+- typescript
+extensions:
+  contentType: samples
+  technologies:
+  - SharePoint Framework
+  createdDate: 1/1/2016 12:00:00 AM
+---
 # Call custom Web API secured with AAD from SharePoint Framework client-side web part
 
 ## Summary