docs: describe style import for old versions

closes #202

Author: d-koppenhagen

docs/get-started.md

@@ -23,7 +23,8 @@ import { createApp } from "vue";
 import App from "./App.vue";
 
 import OpenLayersMap from "vue3-openlayers";
-import "vue3-openlayers/styles.css";
+import "vue3-openlayers/styles.css"; // vue3-openlayers version < 1.0.0-*
+import "vue3-openlayers/dist/vue3-openlayers.css"; // vue3-openlayers version >= 1.0.0-*
 
 const app = createApp(App);
 app.use(OpenLayersMap);