Method with_router

Appends** the router routes to the routes that the server instance holds, this allows you to independently add routes to a route Router structure and then use it with the server struct # Example ``` use octane::prelude::*; let mut app = Octane::new(); let mut router = Router::new(); router.get("/", route!(|req, res| { res.send("It's a get request!!"); Flow::Stop })); router.post("/", route!(|re

(&mut self, router: Router)