readme: add splat documentation
readme: add splat documentation

fly19890211/slim,Nikeshsuwal/slim,XueQian/slim,zakuro9715/slim,mojavelinux/slim,raxoft/slim,yterajima/slim,JuanitoFatas/slim,metallurgical/slim,cheunghy/slim,JuanitoFatas/slim,etdev/slim,slim-template/slim,etdev/slim,ericboehs/slim,slim-template/slim,cheunghy/slim,zakuro9715/slim,ruijsun/slim,XueQian/slim,metallurgical/slim,Nikeshsuwal/slim,fly19890211/slim,raxoft/slim,sideci-sample/sideci-sample-slim,ericboehs/slim,mojavelinux/slim,slim-template/slim,ruijsun/slim