Add login button to lobby screen

src/button/LinkButton.jsx

@@ -0,0 +1,12 @@
+import React from "react";
+import { Link } from "react-router-dom";
+import classNames from "classnames";
+import styles from "./Button.module.css";
+
+export function LinkButton({ className, children, ...rest }) {
+  return (
+    <Link className={classNames(styles.secondary, className)} {...rest}>
+      {children}
+    </Link>
+  );
+}