Upload Modules
To upload a package to Nuget you need an account, so make sure you got that (it is free).
Create an API key
Once logged in to Nuget you can click on your username and select API keys.
Then generate a new key that can push new packages.
Upload Package
dotnet nuget push Crosser.FakeModule.0.0.1.nupkg -k <API_KEY> -s https://api.nuget.org/v3/index.json
Nuget will now validate and index your package. You can see the process for the package if you are logged in to Nuget.
Warning
You will not be able to take the next step until your package is indexed by Nuget, and that might take a while