Example for .csproj file
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="1.1.2" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.2" />
<PackageReference Include="MySql.Data.EntityFrameworkCore" Version="7.0.7-m61" />
</ItemGroup>
Just get package name and version number from NuGet and add to .csproj then save. You will be prompted to run restore that will import new packages.