added react layout with header, main and footer

client/src/components/Header.tsx

@@ -0,0 +1,22 @@
+import React from "react";
+
+const Header: React.FC = () => {
+  return (
+    <header className="bg-blue-600 text-white p-4 shadow-md">
+      <div className="container mx-auto flex justify-between items-center">
+        <h1 className="text-xl font-bold">Bikelane Web</h1>
+        <nav>
+          <ul className="flex space-x-4">
+            <li>
+              <a href="" className="hover:underline">
+                Login
+              </a>
+            </li>
+          </ul>
+        </nav>
+      </div>
+    </header>
+  );
+};
+
+export default Header;