Add GroupBox Control

[AhmedAbuelnour]

i miss this control so much, when i want to group my controls under a certain container has a header

i would like to see this control to come back to live in XMAL standard!

<GroupBox Header="">

</GroupBox>

[michael-hawker]

@A7medRamadan this seems like a good candidate for the https://github.com/Microsoft/UWPCommunityToolkit too, you can add a https://wpdev.uservoice.com/ entry to gauge interest.