ProGet implements NuGet's protocols, so you can use Chocolatey to publish packages to the feed.
To upload from Chocolatey, use the following command:
cpush <package path> -source http://choco.csdesiles.qc.ca/nuget/ChocoCSI/
Note: To use this command, you must have your API key saved for chocolatey.org or the source you want to push to.
In order to save your API key, copy the access key from your chocolatey.org account into the following command:
NuGet SetApiKey <api key> -source http://choco.csdesiles.qc.ca/nuget/ChocoCSI/