docs: add VTL

Author: afontcu

docs/guides/useful-libraries-for-testing.md

@@ -2,6 +2,12 @@
 
 Vue Test Utils provides useful methods for testing Vue components. Community members have also written some additional libraries which either extend `vue-test-utils` with extra useful methods, or provide tools for testing other things found in Vue applications.
 
+### Vue Testing Library
+
+[Vue Testing Library](https://github.com/testing-library/vue-testing-library) is a set of tools focused on testing components without relying on implementation details. Built with accessibility in mind, its approach also makes refactoring a breeze.
+
+It is built on top of Vue Test Utils.
+
 ### `vuex-mock-store`
 
 [`vuex-mock-store`](https://github.com/posva/vuex-mock-store) provides a simple and straightforward mock store to simplify testing components consuming a Vuex store.