This mod (currently) does NOT have any cheats. except for start position which is just a detector if you're on startpos, i have also asked prevter for permission to steal the startpos source code tho ill rewrite that later
To contribute/add themes or color themes, you need to do something first with the source code.
First of all, under ImGui::End();, you can append ImGui::ShowDemoWindow();.
If you manage to compile this (which should workk usually), You may see a new window:
See that Dear ImGui Demo on the right side? That means that you have compiled the mod successfully. Now, you may want to press this button:

Something like this WILL popup if you did everything correctly

You can go over to the Colors tab on Details
And then you can see everything, You will see like:
(R: 230 ) (G: 230 ) (B: 230 ) (A: 255 ) [ ] Text
(R: 153 ) (G: 153 ) (B: 153 ) (A: 255 ) [ ] TextDisabled
(etc.)
You see that bold part? that is the part you want to append to:
struct YourColorPaletteName {
ImVec4 Text;
ImVec4 TextDisabled;
};in your theme file (replace Text or TextDisabled with whatever you want to replace)
And then:
inline const YourColorPaletteName YourColorSchemeName = {
helper::rgba(230, 230, 230, 255), // R = 230, G = 230, B = 230, Alpha/Transparency = 255
helper::rgba(153, 153, 153, 255) // R = 153, G = 153, B = 153, Alpha/Transparency = 255
};