Document superhero storing and improve API response message

api/router.go

@@ -146,7 +146,13 @@ func (r *Router) StoreSuperHero(w http.ResponseWriter, req *http.Request) {
 	// Return JSON
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusCreated)
-	_, err = w.Write([]byte(`{"status": "ok"}`))
+
+	// Response body
+	_, err = w.Write([]byte(`{
+	  "message": "Superhero stored successfully.",
+	  "status": "success"
+	}`))
+
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return