win_compat: Fix backend & file management

This ensure the project builds on windows

README.md

@@ -10,6 +10,8 @@ This is a simple Game Of Life editor written in C++ with raylib & dearImGUI
 
 ## How to compile the project
 
+### Linux
+
 Ensure you have g++, cmake and the dependencies of raylib
 
 ```shell
@@ -19,4 +21,17 @@ cmake ..
 make
 ```
 
-> The windows version might exist one day
+### Windows
+
+If you're compiling for windows on linux, you can use mingw-w64
+
+```shell
+sudo apt install mingw-w64
+mkdir build
+cd build
+cmake .. -DCMAKE_TOOLCHAIN_FILE=../toolchain-ming-w64-x86_64.cmake
+make
+```
+If you're compiling for windows on windows, use your usual cmake workflow
+
+