add notification server message types

ozon/notifications/server.go

@@ -0,0 +1,21 @@
+package notifications
+
+import (
+	"net/http"
+)
+
+type NotificationServer struct{}
+
+func NewNotificationServer() *NotificationServer {
+	return &NotificationServer{}
+}
+
+func (ns *NotificationServer) Run() error {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", ns.handler)
+	return http.ListenAndServe("", mux)
+}
+
+func (ns *NotificationServer) handler(rw http.ResponseWriter, req *http.Request) {
+
+}