chore: release version tag added

Author: nadeem-cs

Contentstack.Core/Contentstack.Core.csproj

@@ -14,6 +14,7 @@
     <PackageProjectUrl>https://github.com/contentstack/contentstack-dotnet</PackageProjectUrl>
     <PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
     <PackageReadmeFile>README.md</PackageReadmeFile>
+    <ReleaseVersion>$(Version)</ReleaseVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">