git subrepo clone git@github.com:t4k/test-subrepo.git subdir/test-subrepo

{"local":
  {"subdir":  "subdir/test-subrepo"
  ,"action":  "clone"}
,"remote":
  {"url":     "git@github.com:t4k/test-subrepo.git"
  ,"branch":  "master"
  ,"commit":  "da5f759"}
,"git-subrepo":
  {"version": "0.1.0"
  ,"commit":  "1d9b6fe"
  ,"origin":  "https://github.com/ingydotnet/git-subrepo"}}