add the microsoft edge kiosk mode deployment preview content

browsers/edge/includes/prevent-first-run-webpage-open-include.md

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+<!-- ## Prevent the First Run webpage from opening on Microsoft Edge -->
+>*Supported versions: Microsoft Edge on Windows 10, version 1703 or later*<br>
+>*Default setting:  Disabled or not configured (Allowed)*
+
+[!INCLUDE [prevent-first-run-webpage-from-opening-shortdesc](../shortdesc/prevent-first-run-webpage-from-opening-shortdesc.md)]
+
+### Allowed values
+
+|Group Policy  |MDM |Registry |Description |Most restricted |
+|---|:---:|:---:|---|:---:|
+|Disabled or not configured<br>**(default)** |0 |0 |Allowed. Microsoft Edge loads the welcome page. | |
+|Enabled |1 |1 |Prevented. |![Most restricted value](../images/check-gn.png) |
+---
+
+### ADMX info and settings
+#### ADMX info
+- **GP English name:** Prevent the First Run webpage from opening on Microsoft Edge
+- **GP name:** PreventFirstRunPage
+- **GP path:** Windows Components/Microsoft Edge
+- **GP ADMX file name:** MicrosoftEdge.admx
+
+#### MDM settings
+- **MDM name:** Browser/[PreventFirstRunPage](https://docs.microsoft.com/en-us/windows/client-management/mdm/policy-csp-browser#browser-preventfirstrunpage)
+- **Supported devices:** Desktop and Mobile
+- **URI full path:** ./Vendor/MSFT/Policy/Config/Browser/PreventFirstRunPage 
+- **Data type:** Integer
+
+####Registry
+- **Path:** HKLM\SOFTWARE\Policies\Microsoft\MicrosoftEdge\Main
+- **Value name:** PreventFirstRunPage
+- **Value type:** REG_DWORD
+
+<hr>