Formatter for Kotlin #493

i am interested in contributing for the file auto formatting for kotlin lanugage
i've checked gofmt pr for reference go uses gofmt which is packaged by go distro as far as i know
but for kotlin can use ktlint by pinterest - https://github.com/pinterest/ktlint
the problem is that when we sue it the user will have to install it
so now are we assuming that user will be having it installed or should we check it and then install it if not present

i we'll have to check then where do we check
do we check using the environment thing?
how do we prompt? like check on environment?

sorry for the rookie mistake if it is but yeah interesed in contributing