feat: publicize doc implemetation

middleware/README.md

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+# MIDDLEWARE
+
+This directory contains your Application Middleware.
+The middleware lets you define custom function to be ran before rendering a page or a group of pages (layouts).
+
+More information about the usage of this directory in the documentation:
+https://nuxtjs.org/guide/routing#middleware
+
+**This directory is not required, you can delete it if you don't want to use it.**