added Layout and weather card

frontend/src/components/Header.tsx

@@ -0,0 +1,19 @@
+import React from "react";
+import Cookies from "js-cookie";
+
+const Header: React.FC = () => {
+  const setApiKey = () => {
+    const apiKey = prompt("Enter your API key:");
+    if (apiKey) {
+      Cookies.set("apiKey", apiKey);
+    }
+  };
+  return (
+    <header>
+      <h1>Weather App</h1>
+      <button onClick={() => setApiKey()}>Set API Key</button>
+    </header>
+  );
+};
+
+export default Header;