add rss service (#117)

* add rss service

* git ignore rss

* update readme

* go fmt

* maintain map by url

* make rss service multi-tenant

rss/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"github.com/micro/micro/v3/service"
+	"github.com/micro/micro/v3/service/logger"
+	"github.com/micro/services/rss/handler"
+	pb "github.com/micro/services/rss/proto"
+)
+
+func main() {
+	// Create service
+	srv := service.New(
+		service.Name("rss"),
+	)
+
+	// Register handler
+	pb.RegisterRssHandler(srv.Server(), handler.NewRss())
+
+	// Run service
+	if err := srv.Run(); err != nil {
+		logger.Fatal(err)
+	}
+}