Update README.md (#2939)

Add's vue-auth-href directive under Authentication/Authorization

Author: nachodd

README.md

@@ -2455,6 +2455,7 @@ the amazing Vue.js.
  - [vue-auth-plugin](https://github.com/d0whc3r/vue-auth-plugin) - A simple authentication and authorization library for Vue.js using typescript
  - [vue-google-signin-button](https://github.com/phanan/vue-google-signin-button) - A simple Vue plugin to include a Google sign-in button into your web app
  - [vue-facebook-signin-button](https://github.com/phanan/vue-facebook-signin-button) - A simple plugin to include a custom Facebook sign-in button into your web app
+ - [vue-auth-href](https://github.com/nachodd/vue-auth-href) - A VueJS directive for downloading files that are under a protected route schema
 
 #### Vuex Utilities