Document and Improve the build system

[HalanoSiblee]

Everything is impressive in this project,, expect the build system
really bunch of windows binarys ? that it !
cc65 compiler exist on other platforms too and other build tools
provide cross-platform building if that possible, thanks.

[ADM228]

On MacOS and Linux you install cc65 into your PATH via the package manager you have

Python is also assumed to be in your PATH as a python3 executable

Modules are auto installed via python and pip

To compile everything run make

Hope this helps~

[ADM228]

Additionally, the build system is being reworked in multiple places in the unified-codebase branch to be more coherent and to have all the three main branches merged into one in addition to improved music and level export systems, and it will be done by October (am busy)

Therefore this is a non-issue that is currently on its way of improvement, and I'm converting this to a discussion

~

[HalanoSiblee]

It's true not a bug, I just compiled the game successfully on my linux system rn
At first I didn't notice the makefile even exist (didn't see it), I apologize for this, didn't know how to build at that moment
now everything works fine.