Add NuGet version to README.md

README.md

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-(Note: This code was originally part of the [DevilDaggersInfo](https://github.com/NoahStolk/DevilDaggersInfo) monorepo. It was moved to a separate repository on September 12th, 2023.)
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 # ddinfo-core
 
+[![NuGet Version](https://img.shields.io/nuget/v/DevilDaggersInfo.Core.svg)](https://www.nuget.org/packages/DevilDaggersInfo.Core/)
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 The DevilDaggersInfo project offers a couple libraries for parsing and creating Devil Daggers files. This is what the website, the web server, and the tools depend on internally.
 
+(Note: This code was originally part of the [DevilDaggersInfo](https://github.com/NoahStolk/DevilDaggersInfo) repository. It was moved to a separate repository on September 12th, 2023.)
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 ## Spawnset files
 
 Spawnsets consist of an arena, a set of spawns, practice values, and some other small features. All features are supported in the `DevilDaggersInfo.Core.Spawnset` library.