Here's the quick description that I would have added if there was both url and text in the initial submission:

Ever wondered if it's worth using a gem? ShouldIGem will generate a report card for a gem of your choice. Gems are graded on things like documentation, freshness, support and popularity. ShouldIGem's goal is to help you narrow down which gems you should use in your next project.

Note - The term "gem" is more branding at this point (I am a Rubyist) but it works for any project on Github - C, Node, Python, Rust, etc.