Update README.md

Author: cephalin

README.md

@@ -1,3 +1,16 @@
+---
+topic: PHP Hello World
+languages:
+  - php
+products:
+  - Azure App Service
+  - Azure Web Apps
+---
+
+# PHP Hello World
+
+This sample demonstrates a tiny Hello World PHP app for [App Service](https://docs.microsoft.com/azure/app-service).
+
 # Contributing
 
 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.