Update README.md

CodingOctocat · web-flow · commit 163628a4aa02 · 2023-07-22T19:59:28.000+08:00
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 Provides ObservableRangeCollection and its WPF version, including AddRange, RemoveRange, Replace/ReplaceRange methods for bulk operation, but only update the notification once.
 
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+[![NuGet](https://buildstats.info/nuget/WpfObservableRangeCollection?includePreReleases=true)](https://www.nuget.org/packages/WpfObservableRangeCollection)
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 ## Classes
 - `ObservableRangeCollection`: Represents a dynamic data collection that provides notifications when items get added, removed, or when the whole list is refreshed.
