Update readme.md

Author: pollyndos

readme.md

@@ -88,10 +88,12 @@ A custom **Online Map** item allows you to place callouts on Google or Bing maps
 
 ![online-map-item](images/online-map-item.png)
 
-- **Provider** - Specifies whether to show Google or Bing maps.
+- **Provider** - Specifies whether to show Azure or Bing maps.
 - **Type** - Specifies the map type. You can choose between `RoadMap`, `Satellite` or `Hybrid`.
 - **Display Mode** - Specifies whether to show markers or routes.
 
+Please specify the credentials for Azure/Bing Maps to ensure maps render correctly. 
+
 ### Web Page
 
 **View Script**: [WebPageItem.js](CS/AspNetCoreCustomItem/wwwroot/js/WebPageItem.js)
@@ -146,9 +148,9 @@ These extensions are distributed under the **MIT** license (free and open-source
 - [Dashboard for ASP.NET Core - Custom Item Tutorials](https://github.com/DevExpress-Examples/asp-net-core-dashboard-custom-item-tutorials)
 - [Dashboard for WinForms - Custom Item Extensions](https://github.com/DevExpress-Examples/winforms-dashboard-custom-items-extension)
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