Add Appleton's "Programming Portals" to catalog

[jryans]

https://maggieappleton.com/programming-portals

The problem isn't just that development environments have grown complex and unwieldy. It's that we've failed to find ways to integrate the benefits of text-based programming and command line interfaces back into graphical interfaces. We're starting to see hints of it though – patterns are appearing that try to bridge the gap.

Programming portals are small, scoped areas within a graphical interface that give users access to command lines and text-based programming. They open a little window into the underlying functionality of an interface. One that lets the user view the underlying properties of their environment, and control a specific set of data, objects, or features of the application.

Suggester: me