Add explanation on how to access the running app

kiaking · kiaking · commit 0bdf1766f7be · 2018-01-15T02:14:04.000+09:00
diff --git a/README.md b/README.md
@@ -18,6 +18,8 @@ $ yarn install
 $ yarn dev
 ```
 
+Then you can access http://localhost:3000 to play with the app!
+
 ## Contribution
 
 If you have any idea to make this example application easier to understand to people who are new to the Vuex ORM, please open an issue, or pull request :tada:
