NuGet.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <!-- `clear` ensures no additional sources are inherited from another config file. -->
  <packageSources>
    <clear />
    <!-- `key` can be any identifier for your source. -->
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
  </packageSources>

  <!-- Define mappings by adding package patterns beneath the target source. -->
  <packageSourceMapping>
    <!-- key value for <packageSource> should match key values from <packageSources> element -->
    <packageSource key="nuget.org">
      <package pattern="*" />
    </packageSource>
  </packageSourceMapping>
</configuration>

<!--
As an example, you can define multiple package sources and map particular nuget packages from each source.
This defines the package sources, nuget.org and contoso.com and maps all NuGet packages with Contoso.* to it.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <clear />
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
    <add key="contoso.com" value="https://contoso.com/packages/" />
  </packageSources>
  
  <packageSourceMapping>
    <packageSource key="nuget.org">
      <package pattern="*" />
    </packageSource>
    <packageSource key="contoso.com">
      <package pattern="Contoso.*" />
    </packageSource>
  </packageSourceMapping>
</configuration>
-->