Add auth target

src/core/client/auth/components/App.css

@@ -0,0 +1,15 @@
+/* Here we add global stylings for body and document */
+:global {
+  body {
+    margin: "0";
+
+    /* Support for all WebKit browsers. */
+    -webkit-font-smoothing: antialiased;
+    /* Support for Firefox. */
+    -moz-osx-font-smoothing: grayscale;
+  }
+}
+
+.root {
+  width: 100%;
+}

src/core/client/auth/components/App.tsx

@@ -0,0 +1,22 @@
+import * as React from "react";
+import { StatelessComponent } from "react";
+
+import { Flex } from "talk-ui/components";
+
+import * as styles from "./App.css";
+
+export interface AppProps {
+  // TODO: (cvle) Remove %future added value when we have Relay 1.6
+  // https://github.com/facebook/relay/commit/1e87e43add7667a494f7ff4cfa7f03f1ab8d81a2
+  view: "SIGN_UP" | "SIGN_IN" | "FORGOT_PASSWORD" | "%future added value";
+}
+
+const App: StatelessComponent<AppProps> = props => {
+  return (
+    <Flex justifyContent="center" className={styles.root}>
+      Hello World
+    </Flex>
+  );
+};
+
+export default App;