Motivation
Ability to know which filters/functions (nodes) are implemented without installing the software.

Description
In a wiki page or as a markdown file in the repository, list filters and options: e.g. blend modes, shapes of the erode/dilate nodes
It might be a very simple list or a more detailed description: link to existing explanation of what this node does and/or document it with a very simple example (like in the OpenCV documentation)