Add theme. Create basic layout.

App.js

@@ -6,11 +6,56 @@
  * @flow
  */
 
-import React from "react";
+import React, { useState } from "react";
+import {
+	Appbar,
+	BottomNavigation,
+	Text,
+	Card,
+} from "react-native-paper";
+
+
+function Dummy() {
+	return (
+		<Card>
+			<Card.Title title="Card Title" />
+			<Card.Content>
+				<Text>Dummy</Text>
+			</Card.Content>
+		</Card>
+	);
+}
 
 const App = () => {
+	const [ pane, setPane ] = useState({
+		index: 0,
+		routes: [
+			{ key: "update", title: "Update", icon: "plus-circle" },
+			{ key: "statistics", title: "Statistics", icon: "file-chart" },
+			{ key: "timetable", title: "Time Table", icon: "calendar-clock" },
+		],
+	});
+	const renderScene = BottomNavigation.SceneMap({
+		update: Dummy,
+		statistics: Dummy,
+		timetable: Dummy,
+	});
 	return (
 		<>
+			<Appbar.Header>
+				<Appbar.Content
+					title="Sonzai"
+				/>
+			</Appbar.Header>
+			<BottomNavigation
+				navigationState={pane}
+				onIndexChange={(index) => setPane({
+					index,
+					routes: pane.routes
+				})}
+				renderScene={renderScene}
+				shifting={true}
+			/>
 		</>
 	);
 };

index.js

@@ -6,11 +6,21 @@ import React from "react";
 import {AppRegistry} from "react-native";
 import App from "./App";
 import {name as appName} from "./app.json";
-import { Provider } from "react-native-paper";
+import { DarkTheme, Provider } from "react-native-paper";
+
+const theme = {
+	...DarkTheme,
+	mode: "exact",
+	colors: {
+		...DarkTheme.colors,
+		primary: "#e91e63",
+		accent: "#3f51b5",
+	}
+};
 
 export default function Main() {
 	return (
-		<Provider>
+		<Provider theme={theme}>
 			<App />
 		</Provider>
 	);