Create crond scheduler and dependencies and store to disk

scheduler/errors.go

@@ -0,0 +1,8 @@
+package scheduler
+
+import "errors"
+
+var ErrBadCron = errors.New("bad cron input detected")
+var ErrBadRunner = errors.New("bad cron runner")
+var ErrJobNotFound = errors.New("bad job name given")
+var ErrDuplicateJob = errors.New("duplicate job name given")