chore: Add nuget package badge

Author: s2quake

README.md

@@ -1,5 +1,9 @@
 # Randora
 
+[![NuGet](https://img.shields.io/nuget/v/JSSoft.Randora.svg?label=release)](https://www.nuget.org/packages/JSSoft.Randora/)
+[![NuGet (prerelease)](https://img.shields.io/nuget/vpre/JSSoft.Randora.svg?label=preview)](https://www.nuget.org/packages/JSSoft.Randora/)
+[![License](https://img.shields.io/github/license/s2quake/randora.svg)](https://github.com/s2quake/randora/blob/main/LICENSE.md)
+
 A lightweight random-value utility. It provides simple APIs to generate a wide range of data: primitives, collections, enums, text, time values, shuffles, and more.
 
 ## Supported frameworks
@@ -28,7 +32,7 @@ To use it project-wide, add a using alias via GlobalUsings or your project file
 
 ```xml
 <ItemGroup>
-	<Using Include="JSSoft.Randora.RandomUtility" Alias="R" />
+  <Using Include="JSSoft.Randora.RandomUtility" Alias="R" />
 </ItemGroup>
 ```