Create create_url_route.md

core/docs/create_url_route.md

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+# Creating a new URL route
+
+First of all, a new route implies a new Controller*. But before creating the Controller, let's register the new path for the app router.
+
+\* A Controller is a Widget subclass designed for being loaded at root level --- the first widget in a page, has no parent
+
+## 1. Registering the route
+
+## 2. Creating the controller