Merge pull request #355 from microsoft/kegu/updatewin2d

upgrade Win2d version to 1.26.0 and updated platform toolset to be compatible with VS2019

Merge pull request #309 from microsoft/animationcompleted

Adding AnimationCompleted API Reference sample

Merge pull request #338 from microsoft/robmikh/removevideolink

Remove link button from Video Playground sample

Adding description, yml indentation

Trying adding a description; and also making the indentation of the yml exactly match a repo that has been ingested into the samples browser.

changing readme to trigger webhook...

...and doing a very light editorial pass in the process.

PR 25194: Updated Windows UI Samples for BUILD 2016

Updated Windows UI Samples for BUILD 2016