Adding a nuget.config
in the project solves it for the project. Adding to the root is ok. The config could look like this:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<packageSources>
<add key="MyGet" value="https://www.myget.org/F/aspnet-contrib/api/v3/index.json" />
</packageSources>
</configuration>