Create social preview image banners for all libraries

[chapulina]

GitHub supports adding a custom open graph images to each repository so that they display nicely when shared on social media:

https://github.blog/2019-04-17-custom-open-graph-images-for-repositories/

It would be nice to create specific images for each library. I suggest adding the image to each repository with the name banner.png, and one of the maintainers can make it the official banner.

It would be cool to have banners specific to each library that highlight their functionality.

Here's GitHub's template:

[Dasux]

why is this issue still open

[azeey]

I don't think any of the libraries have a banner yet. Are you interested in working on it?