Update README.md Section ####Other to windows

[hi20160616]

Please provide Issues links to:

• Issues: Cross Compilation(Linux->Win) error #228 ./bitmap/../base/zlib_util_c.h:2:18: fatal error: zlib.h: No such file or directory #100

Add code:

sudo apt-get install gcc-multilib
sudo apt-get install gcc-mingw-w64
sudo apt-get install libz-mingw-w64-dev

Description

I'd try and pass test for cross-compile on ubuntu to windows i386 and x86_64, my case: https://github.com/hi20160616/robotclick/blob/main/.github/workflows/goreleaser.yml

I dig and read many issues here, and collect the right way to cross-compile for windows binary.
I think it will help someone like me to fix bugs while cross compile.
like error zlib.h cannot find out usually because of we installed it via source, that not useful on mingw-w64.
I also suggest this update to let newbee easy to use this grand code.

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[vcaesar]

This section should be in ## CrossCompiling #### Other to windows.

[hi20160616]

This section should be in ## CrossCompiling #### Other to windows.

OK, done.