Adding Deprecation Warning to Vue Router

# Introduction

In this project, you will learn how to add a deprecation warning to the `router.addRoutes()` method in the `vue-router-3.4.9` version. This is an important task as the `router.addRoutes()` method has been deprecated in Vue Router v3.5.0 and has been removed in Vue Router 4. By adding the deprecation warning, you can help developers using the older version of Vue Router to be aware of the upcoming changes and migrate to the new `router.addRoute()` method.

## 👀 Preview


## 🎯 Tasks

In this project, you will learn:

- Locate the `addRoutes` method in the `vue-router-3.4.9/src/index.js` file
- Add a deprecation warning to the `addRoutes` method
- Rebuild and publish the updated `vue-router-3.4.9` package
- Restart the application and observe the warning message in the browser console

## 🏆 Achievements

After completing this project, you will be able to:

- Identify and modify deprecated methods in a library
- Understand the importance of providing deprecation warnings to help developers transition to newer versions
- Learn the process of rebuilding and publishing an updated version of a library
- Observe the effects of your changes in the running application