On a couple blog posts, talking about software projects I've seen a small thing that when clicked causes you to star the project on GitHub. It's about the same size as one of the things to like something on Facebook. I want one of those for this project. How do I make one of those?
It looks like GitHub does provide this functionality - See https://buttons.github.io/
It doesn't look like this is provided by GitHub per se, but the source code for the buttons I saw is available at https://ghbtns.com/.