Scaffold out UI components

src/components/App/App.tsx

@@ -1,22 +1,18 @@
 import React from "react";
-import { Toolbar, IconGrid } from "../";
 
-const App = () => {
+import { Header, Toolbar, IconGrid, Footer } from "../";
+import "./App.css";
+
+const App: React.FC<any> = () => {
   return (
-    <div>
-      <header>
-        <h1>Phosphor Icons</h1>
-        <a
-          href="https://play.google.com/store/apps/details?id=com.tobiasfried.phosphor"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          on the play store
-        </a>
-      </header>
-      <Toolbar />
-      <IconGrid />
-    </div>
+    <>
+      <Header />
+      <main>
+        <Toolbar />
+        <IconGrid />
+      </main>
+      <Footer />
+    </>
   );
 };