Updated metadata (#64)

Updated metadata to enable new samples browser experience

Author: Phil Meadows

README.md

@@ -1,3 +1,12 @@
+---
+page_type: sample
+languages:
+- csharp
+products:
+- azure
+- digital-twins
+---
+
 # Digital Twins Samples
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Contribute](https://img.shields.io/badge/PR%27s-welcome-brightgreen.svg)](CONTRIBUTING.md)