add dummy routes and handlers and update makefile

service_a/internal/domains/meteo/router.go

@@ -0,0 +1,8 @@
+package meteo
+
+import "net/http"
+
+func RegisterRoutes(mux *http.ServeMux, handler *Handler) {
+	mux.HandleFunc("POST /ingest/csv", handler.IngestCSV)
+	mux.HandleFunc("POST /ingest/excel", handler.IngestExcel)
+}