Put external dependencies into dedicated directories

tubio-frontend-nuxt-app/store/README.md

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+# STORE
+
+**This directory is not required, you can delete it if you don't want to use it.**
+
+This directory contains your Vuex Store files.
+Vuex Store option is implemented in the Nuxt.js framework.
+
+Creating a file in this directory automatically activates the option in the framework.
+
+More information about the usage of this directory in [the documentation](https://nuxtjs.org/guide/vuex-store).