Update README.md

Add serialization example

README.md

@@ -48,6 +48,7 @@
   - [Pattern](#pattern)
   - [Marker](#marker)
 - [Touch Events](#touch-events)
+- [Serialize](#serialize)
 - [Run example](#run-example)
 - [TODO](#todo)
 - [Known issues](#known-issues)
@@ -1220,6 +1221,67 @@ You can use these events to provide interactivity to your react-native-svg compo
 
 For more examples of touch in action, checkout the [TouchEvents.js examples](https://github.com/magicismight/react-native-svg-example/blob/master/examples/TouchEvents.js).
 
+### Serialize
+
+```jsx
+import * as React from "react";
+import { Platform, StyleSheet, TouchableOpacity } from "react-native";
+import { Svg, Rect } from "react-native-svg";
+import ReactDOMServer from "react-dom/server";
+
+const isWeb = Platform.OS === "web";
+
+const childToWeb = child => {
+  const { type, props } = child;
+  const name = type && type.displayName;
+  const webName = name && name[0].toLowerCase() + name.slice(1);
+  const Tag = webName ? webName : type;
+  return <Tag {...props}>{toWeb(props.children)}</Tag>;
+};
+
+const toWeb = children => React.Children.map(children, childToWeb);
+
+export default class App extends React.Component {
+  renderSvg() {
+    return (
+      <Svg height="100%" width="100%" style={{ backgroundColor: "#33AAFF" }}>
+        <Rect
+          x="50"
+          y="50"
+          width="50"
+          height="50"
+          fill="#3399ff"
+          strokeWidth="3"
+          stroke="rgb(0,0,0)"
+        />
+      </Svg>
+    );
+  }
+  serialize = () => {
+    const element = this.renderSvg();
+    const webJsx = isWeb ? element : toWeb(element);
+    const svgString = ReactDOMServer.renderToStaticMarkup(webJsx);
+    console.log(svgString);
+  };
+  render() {
+    return (
+      <TouchableOpacity style={styles.container} onPress={this.serialize}>
+        {this.renderSvg()}
+      </TouchableOpacity>
+    );
+  }
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    justifyContent: "center",
+    backgroundColor: "#ecf0f1",
+    padding: 8
+  }
+});
+```
+
 ### Run example:
 
 ```bash