Update README.md

Author: augini

Diff for: README.md

@@ -277,6 +277,62 @@ export default class FetchExample extends React.Component<{}, State> {
   }
 }
 ```
+#### Networking in Functional Components
+```ts
+import React, { useState, useEffect } from "react";
+import { FlatList, ActivityIndicator, Text, View } from "react-native";
+
+type DataItem = { title: string; releaseYear: string; id: string };
+
+type State = {
+  isLoading: boolean;
+  dataSource?: DataItem[];
+};
+
+const FetchExample = ({ }: State) => {
+  const [isLoading, setIsLoading] = useState(true)
+  const [dataSource, setDataSource] = useState()
+
+
+  useEffect(() => {
+    fetch("https://facebook.github.io/react-native/movies.json")
+      .then(response => response.json())
+      .then((responseJson: { movies: any }) => {
+        setIsLoading(false)
+        setDataSource(responseJson.movies)
+      })
+      .catch(error => {
+        console.error(error);
+      });
+
+  }, [])
+
+
+  if (isLoading)
+    return (
+      <View style={{ flex: 1, padding: 20 }}>
+        <ActivityIndicator />
+      </View>
+    );
+
+
+  return (
+    <View style={{ backgroundColor: 'red' }}>
+      <FlatList
+        data={dataSource}
+        renderItem={({ item }) => (
+          <Text>
+            {item.title}, {item.releaseYear}
+          </Text>
+        )}
+        keyExtractor={({ id }, index) => id}
+      />
+    </View>
+  );
+
+}
+export default FetchExample
+```
 
 ## Contributing