Add probot configuration file (#412)
Add probot configuration file (#412)

Initial configuration specifies that "first-timers only" issues should
be exempt from cleanup.
FridaTveit/xjava,FridaTveit/xjava,exercism/xjava,jmluy/xjava,jmluy/xjava,jtigger/xjava,exercism/xjava,jtigger/xjava