Merge pull request #5296 from MicrosoftDocs/drewbat/copilot-key-cert

Adding info about cert requirement

Author: drewbatgit

hub/apps/develop/windows-integration/copilot-key-state.md

@@ -266,3 +266,6 @@ private LRESULT WindowSubClass(HWND hWnd, uint uMsg, WPARAM wParam, LPARAM lPara
 }
 ```
 
+## Sign your Windows Copilot hardware key provider.
+
+Provider apps must be signed in order to be enabled as a target of the Microsoft Copilot hardware key. For information on packaging and signing your app, see [Package a desktop or UWP app in Visual Studio](https://learn.microsoft.com/en-us/windows/msix/package/packaging-uwp-apps).

hub/apps/develop/windows-integration/microsoft-copliot-key-provider.md

@@ -53,3 +53,8 @@ The following table *uap3:AppExtension* describes the attributes of the **uap3:A
 | DisplayName | The app name displayed in the Windows Copilot hardware button picker UI.  | Yes |
 | Description | The app description displayed in the Windows Copilot hardware button picker UI. | Yes |
 | PublicFolder|  The folder that the instance declares as the location where a host can have read access to files through a broker. | Yes | 
+
+
+## Sign your Windows Copilot hardware key provider.
+
+Provider apps must be signed in order to be enabled as a target of the Microsoft Copilot hardware key. For information on packaging and signing your app, see [Package a desktop or UWP app in Visual Studio](https://learn.microsoft.com/en-us/windows/msix/package/packaging-uwp-apps).