Add consul package comment

registry/consul/consul.go

@@ -1,9 +1,11 @@
+// Package consul provides a consul based registry and is the default discovery system
 package consul
 
 import (
 	"github.com/micro/go-micro/registry"
 )
 
+// NewRegistry returns a new consul registry
 func NewRegistry(opts ...registry.Option) registry.Registry {
 	return registry.NewRegistry(opts...)
 }