Add todo to explain problem for local development/debugging

test/test-pages/test-gmapApi.html

@@ -22,6 +22,8 @@
   <script src="../../dist/vue-google-maps.js"></script>
 
   <script>
+    /* todo all this examples useless, because owner migrated code but not test examples, whole folder "tests" */
+    /* todo still use vue2.5, need to remove this folder, or make it workable */
     Vue.use(VueGoogleMaps, {
       load: {
         key: 'AIzaSyDf43lPdwlF98RCBsJOFNKOkoEjkwxb5Sc',