Update setting-up-your-telerik-reporting-license-key.md (#1944)

* Update setting-up-your-telerik-reporting-license-key.md

* Update setting-up-your-telerik-reporting-license-key.md

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Co-authored-by: Todor Arabadzhiev <todor.arabadzhiev@progress.com>

Author: dessyordanova

licensing/setting-up-your-telerik-reporting-license-key.md

@@ -112,6 +112,7 @@ If you cannot use NuGet packages in your project, add the license as a code snip
 
 1. Copy the C# code snippet into a new file, for example, `TelerikLicense.cs`.
 1. Add the `TelerikLicense.cs` file to your project.
+1. Add an assembly reference to `Telerik.Licensing.Runtime.dll`.
 
 > Do not publish the license key code snippet in publicly accessible repositories. This is your personal license key.