Badge request: ProGet NuGet feeds

:clipboard: **Description**

- Service: Inedo [ProGet](https://inedo.com/proget)
- Latest Version (), Latest Prerelease (), Download Count ()

Specifically, we're looking for support for the `nuget` feeds, but there are a lot of other feed types that others could find useful.

:link: **Data**

ProGet supports [many types of artifact feeds](https://inedo.com/support/documentation/proget/feeds/nuget). This issue is specifically looking to add support for the `nuget` feeds. other feeds supported by ProGet:

- NuGet
- PowerShell Packages / Modules
- Ruby Gems
- Visual Studio Extensions
- Maven
- npm
- Bower
- Chocolatey
- Docker

I'd be willing to contribute support for the `nuget` feed, although I'm not sure if this would be better off as a generic addition to the existing `nuget` service that supports arbitrary feed URL's or as it's own service so support for other feed types can be added later.

Start by reviewing the existing nuget service and the linked ProGet NuGet feed documentation. Determine whether arbitrary feed URLs fit that service or require a separate service; done means supporting ProGet NuGet feeds for latest version, prerelease, and download-count badges.

Written by the indexing model from the issue text.