Update README.md

README.md

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 A demo to test Microsoft's ItemsRepeater's preformance on XBox one S.
 
-Related issue:
+**Related issue:
 
-Issue 1: https://github.com/microsoft/microsoft-ui-xaml/issues/1699
+*Issue 1: https://github.com/microsoft/microsoft-ui-xaml/issues/1699
 
-Issue 2: https://github.com/windows-toolkit/WindowsCommunityToolkit/issues/3080
+*Issue 2: https://github.com/windows-toolkit/WindowsCommunityToolkit/issues/3080
 
-Video
+**Video
 
 [![ImageEx causes performance issue on Xbox One S](https://i.ibb.co/hFQ4Gqp/https-i-ytimg-com-vi-o-FLVUq7p9o8-hqdefault.jpg)](https://youtu.be/oFLVUq7p9o8 "ImageEx causes performance issue on Xbox One S")