Please help with translating READMEs for Pyxel 1.5.0
Hi all,

I released Pyxel 1.5.0 but its READMEs are not translated perfectly and some parts are written in English.
It would be appreciated if some volunteers help with translation.

Especially volunteer members who translated READMEs before, please consider it. Thank you.
@YifangSun @humrochagf @gamwe6 @grewn0uille @Nadpher @dora-0 @KoschenkoVlad @Koshchanka 