add libsvx link for README
add libsvx link for README

waruqi/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,tboox/xmake,tboox/xmake,tboox/xmake