Add sections for installing pick on FreeBSD
Add sections for installing pick on FreeBSD

calleerlandsson/pick,DBOTW/pick,prahlad37/pick,thoughtbot/pick,thoughtbot/pick,thoughtbot/pick,thoughtbot/pick,prahlad37/pick,calleerlandsson/pick,prahlad37/pick,prahlad37/pick,DBOTW/pick,DBOTW/pick,calleerlandsson/pick