docs: add simple router book

docs/router/src/guide/index.md

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+# Dioxus Router: Guide
+In this guide you'll learn to effectively use Dioxus Router whether you're building a small todo app or the next FAANG company. We will create a small website with a blog, homepage, and more!
+
+#### You'll learn how to
+- Create routes and render "pages".
+- Utilize nested routes, create a navigation bar, and render content for a set of routes.
+- Gather URL parameters to dynamically display content.
+- Redirect your visitors wherever you want.
+
+> Disclaimer
+>
+> This site will only display the features of Dioxus Router. It will not include any actual functionality. To keep things simple we will only be using a single file, this is not the recommended way of doing things with a real application.
+
+You can find the complete application [here](https://github.com/DogeDark/dioxus-router-example).