Windows Build (MinGW)

[extremeYes]

Wrote the Windows build instructions and included raylib_5.5 for Windows.

This is the first PR of my life, so please don't get frustrated if I made mistakes. Maybe this is not wanted in the repo but I wanted to build the project.

Also, nob version in your template is old and that got reflected here. (got a few warnings in main.c compilation regarding directory-walking functions -- don't know if it has any importance)

[INFO] CMD: cc -Wall -Wextra -ggdb -I./raylib-5.5_win64_mingw-w64/include/ -o main.exe main.c -L./raylib-5.5_win64_mingw-w64/lib/ -lraylib -lgdi32 -lwinmm
In file included from main.c:4:
nob.h:771:13: warning: 'opendir' declared 'static' but never defined [-Wunused-function]
  771 | static DIR *opendir(const char *dirpath);
      |             ^~~~~~~
nob.h:772:23: warning: 'readdir' declared 'static' but never defined [-Wunused-function]
  772 | static struct dirent *readdir(DIR *dirp);
      |                       ^~~~~~~
nob.h:773:12: warning: 'closedir' declared 'static' but never defined [-Wunused-function]
  773 | static int closedir(DIR *dirp);
      |            ^~~~~~~~

Those get fixed if using latest nob.

Thanks bye.