feat: add routing

src/components/Navbar/Navbar.js

@@ -0,0 +1,20 @@
+import React from "react";
+import { Link } from "react-router-dom";
+
+const Navbar = () => (
+  <div>
+    <ul>
+      <li>
+        <Link to={"/"}>Landing</Link>
+      </li>
+      <li>
+        <Link to={"/signin"}>Sign In</Link>
+      </li>
+      <li>
+        <Link to={"/user"}>Account</Link>
+      </li>
+    </ul>
+  </div>
+);
+
+export default Navbar;