Add react native js components

src/AuthLoading.js

@@ -0,0 +1,26 @@
+import React from 'react';
+import {
+    ActivityIndicator,
+    AsyncStorage,
+    StatusBar,
+    StyleSheet,
+    View,
+} from 'react-native';
+import SharedPreferences from 'react-native-shared-preferences';
+
+export default class AuthLoadingScreen extends React.Component {
+    componentDidMount() {
+        SharedPreferences.getItem('@global:token', (token) => {
+            this.props.navigation.navigate(token ? 'Messages' : 'Login');
+        });
+    }
+
+    render() {
+        return (
+            <View >
+                <ActivityIndicator />
+                <StatusBar barStyle="default" />
+            </View>
+        );
+    }
+}