Update example-navigation.md

Hi 👋 
My name is Steve Galili, big fan of the library I've discovered lately after participating in a workshop given by Kent.
I've added an extra navigation example that suits react-navigation v5. 

It will be great if you could update this in your docs.
I have more examples up my sleeve see my example repo https://github.com/vanGalilea/react-native-testing

I would be happy to contribute more to this repo, if you need more help.

Email- [email protected]
Twitter- https://twitter.com/vanGalilea

Greetings,

Steve

Author: Steve Galili

docs/example-navigation.md

@@ -4,6 +4,98 @@ title: Navigation
 sidebar_label: Navigation
 ---
 
+### react-navigation v5
+```js
+// jest.config.js 
+
+// react-native-gesture-handler use native modules, we mock it by using it's build in jestSetup. 
+// react-navigations will try to import it's assets, to avoid an error we will mock it by using a custom assets transformer 
+
+module.exports = {
+    preset: '@testing-library/react-native',
+    setupFiles: ["./node_modules/react-native-gesture-handler/jestSetup.js"],
+    moduleNameMapper: {
+        "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/assetsTransformer.js",
+        "\\.(css|less)$": "<rootDir>/assetsTransformer.js"
+    }
+}
+```
+
+```js
+// assetsTransformer.js 
+// see https://jestjs.io/docs/en/webpack.html#handling-static-assets
+const path = require('path')
+
+module.exports = {
+  process(src, filename, config, options) {
+    return 'module.exports = ' + JSON.stringify(path.basename(filename)) + ';'
+  },
+}
+```
+
+```js
+import React from 'react';
+import { Button, Text, View } from 'react-native';
+import {NavigationContainer, useNavigationState} from '@react-navigation/native'
+import {createStackNavigator} from '@react-navigation/stack'
+import {fireEvent, render, wait} from '@testing-library/react-native'
+
+const Home = ({ navigation }) => (
+  <View>
+    <Text testID="title">Home page</Text>
+    <Button title="About page" onPress={() => navigation.navigate('About')} />
+  </View>
+);
+const About = ({ navigation }) => (
+  <View>
+    <Text testID="title">About page</Text>
+    <Button title="About page" onPress={() => navigation.navigate('Home')} />
+  </View>
+);
+const Location = () => (
+  <View>
+    <Text testID="title">Location page</Text>
+    <LocationDisplay />
+  </View>
+);
+
+const LocationDisplay = (() => {
+  const routeName = useNavigationState(state => state.routes[state.index].name);
+  return (
+    <Text testID="location-display">{routeName}</Text>
+  )
+});
+
+const Stack = createStackNavigator()
+
+const renderWithNavigation = ({ screens = {}, navigatorConfig = {} } = {})=>
+  render(<NavigationContainer>
+    <Stack.Navigator {...navigatorConfig}>
+      <Stack.Screen name="Home" component={Home} />
+      <Stack.Screen name="Location" component={Location} />
+      {
+        Object.keys(screens).map(name=> <Stack.Screen key={name} name={name} component={screens[name]} />)
+      }
+    </Stack.Navigator>
+  </NavigationContainer>)
+
+test('full app rendering/navigating', () => {
+  const { findByText, getByTestId, getByText } = renderWithNavigation({screens: {About}});
+  expect(getByTestId('title').props.children).toMatch('Home page');
+  fireEvent.press(getByText(/About page/i));
+  expect(findByText('About page')).toBeTruthy();
+});
+
+test('rendering a component that uses withNavigation', async () => {
+  const initialRouteName = 'Location';
+  const { getByTestId } = renderWithNavigation({
+    navigatorConfig: { initialRouteName },
+  });
+  await wait(()=> expect(getByTestId('location-display').props.children).toBe(initialRouteName));
+});
+```
+
+### react-navigation v4
 
 ```js
 // <project-root-path>/__mocks__/react-native-gesture-handler.js
@@ -16,7 +108,6 @@ export const BaseButton = View;
 export const Directions = {};
 ```
 
-
 ```javascript
 import React from 'react';
 import { Button, Text, View } from 'react-native';