Added 2 more nodes an RGB Curve node and a Hue/Saturation node. These work the same/similar to the cycles nodes.
These behind the scenes add quite a few additional calculations (30 in the case of hue/saturation) so using these too much might slow down your renders.
Also the Hue/Saturation is approximated using pre-calculated matrix transforms on the color, so it is close to the cycles shader nodes but maybe not exactly, particular in colors on the edges of both color systems.
Next step is to create corresponding corona nodes from cycles nodes where possible. Then it will be up to you to finish it off. To start with, an output node, a material node, image textures.