Defines Vue.js Expert Role

Currently we have a vue.js expert role that is not defined
By defining this role we can improve our Vue and Vuex code.

doc/development/fe_guide/vue.md

@@ -221,6 +221,14 @@ const vm = mountComponent(Component, data);
 The main return value of a Vue component is the rendered output. In order to test the component we
 need to test the rendered output. [Vue][vue-test] guide's to unit test show us exactly that:
 
+## Vue.js Expert Role
+One should apply to be a Vue.js expert by opening an MR when the MR's they create and review show:
+- Deep understanding of Vue and Vuex reactivy
+- Vue and Vuex code are structured according to both official and our guidelines
+- Full test coverage of a Vue and Vuex application
+- Vuex code follows the [documented pattern](./vuex.md#actions-pattern-request-and-receive-namespaces)
+- Knowledge about the existing Vue and Vuex codebase and existing reusable components
+
 
 [vue-docs]: http://vuejs.org/guide/index.html
 [issue-boards]: https://gitlab.com/gitlab-org/gitlab-ce/tree/master/app/assets/javascripts/boards