add links and notes about supported distros
add links and notes about supported distros

jimjag/ponymail,quenda/ponymail,jimjag/ponymail,rbowen/ponymail,quenda/ponymail,jimjag/ponymail,rbowen/ponymail,Humbedooh/ponymail,jimjag/ponymail,Humbedooh/ponymail,rbowen/ponymail,Humbedooh/ponymail,quenda/ponymail