To read an embedded text file in a .NET Standard 2.0 project use the following code snippet.

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string file;
var assembly = typeof({YOUR_CLASS_NAME}).GetTypeInfo().Assembly;

using (var stream = assembly.GetManifestResourceStream("{YOUR_NAMESPACE}.{FILE_NAME}.txt"))
{
    using (var reader = new StreamReader(stream))
    {
        file = reader.ReadToEnd();
    }
}
return file;

To aid in debugging assembly.GetManifestResourceNames() will return the names of all the embedded resources in an assembly.