Create a file NeonWhitePlugin/NeonWhitePlugin.csproj.user
defining the path to your Neon White folder. An example
with Windows Steam on the C drive is shown below:
<Project>
<PropertyGroup>
<NeonWhitePath>C:/Program Files (x86)/Steam/steamapps/common/Neon White</NeonWhitePath>
</PropertyGroup>
</Project>