Add: register button on manage page

web/src/component/Manage.js

@@ -9,13 +9,22 @@ function Manage(props) {
       <h2>Manage</h2>
       <p>Hi, {props.user.username}</p>
       {props.user.role === 0 && (
-        <button
+        <div>
-          onClick={() => {
+          <button
-            navigate("/manage/login");
+            onClick={() => {
-          }}
+              navigate("/manage/login");
-        >
+            }}
-          Login
+          >
-        </button>
+            Login
+          </button>
+          <button
+            onClick={() => {
+              navigate("/manage/register");
+            }}
+          >
+            Register
+          </button>
+        </div>
       )}
       {props.user.role !== 0 && (
         <div className="horizontal">