override the builtin function cd in .bashrc for wsl pathes to work automatically

builtin_cd.sh

#copy and paste in .bashrc and then: soruce .bashrc
# for windows pathes, you need to wrap it in double quotes

function cd() {
  if [[ $@ == *"\\"* ]]; then
    p=`wslpath "$@"`
    builtin cd "$p"
  else
    builtin cd "$@"
  fi
}