chore: add missing PackageReadmeFile tag in csproj file

Author: altJake

src/TalonOne/TalonOne.csproj

@@ -34,6 +34,7 @@ Contact: [email protected]
     <RepositoryUrl>https://github.com/talon-one/TalonOne.cs.git</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <PackageProjectUrl>https://github.com/talon-one/TalonOne.cs</PackageProjectUrl>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
   <ItemGroup>