Merge pull request #2812 from HHChaos/master

Add the ImageCropper document link to readme.md

readme.md

@@ -94,6 +94,7 @@ Once you do a search, you should see a list similar to the one below (versions m
 * [HeaderedContentControl](https://docs.microsoft.com/windows/uwpcommunitytoolkit/controls/HeaderedContentControl/)
 * [HeaderedItemsControl](https://docs.microsoft.com/windows/uwpcommunitytoolkit/controls/HeaderedItemsControl/)
 * [HeaderedTextBlock](https://docs.microsoft.com/windows/uwpcommunitytoolkit/controls/HeaderedTextBlock/)
+* [ImageCropper](https://docs.microsoft.com/windows/uwpcommunitytoolkit/controls/ImageCropper/)
 * [ImageEx](https://docs.microsoft.com/windows/uwpcommunitytoolkit/controls/ImageEx/)
 * [InAppNotification](https://docs.microsoft.com/windows/uwpcommunitytoolkit/controls/InAppNotification/)
 * [InfiniteCanvas](https://docs.microsoft.com/windows/uwpcommunitytoolkit/controls/InfiniteCanvas/)