adding an API GET Location endpoint, fetch locations and list them in vue multiselect

src/Bundle/ChillActivityBundle/Resources/public/vuejs/Activity/store.js

@@ -114,6 +114,10 @@ const store = createStore({
           state.activity.users = state.activity.users.filter(user => user !== payload);
           break;
       };
+    },
+    updateLocation(state, value) {
+        console.log('### mutation: updateLocation', value);
+        state.activity.location = value;
     }
   },
   actions: {