Add demo for updated react-native-threads on RN 0.70+

joltup/react-native-threads#155 (comment)

App.js

@@ -1,10 +1,20 @@
 import { StatusBar } from 'expo-status-bar';
-import { StyleSheet, Text, View } from 'react-native';
+import { StyleSheet, Text, View, Button } from 'react-native';
+import { Thread } from 'react-native-threads';
+
+// start a new react native JS process
+const thread = new Thread('./thread.js');
 
 export default function App() {
   return (
     <View style={styles.container}>
       <Text>Open up App.js to start working on your app!</Text>
+      <Button title='hello' onPress={()=>{
+          // send a message, strings only
+          thread.postMessage('hello from app.js');
+          // listen for messages
+          thread.onmessage = (message) => console.log(message);
+      }}></Button>
       <StatusBar style="auto" />
     </View>
   );

ios/Podfile.lock

@@ -447,6 +447,8 @@ PODS:
     - React-jsi (= 0.72.6)
     - React-logger (= 0.72.6)
     - React-perflogger (= 0.72.6)
+  - RNThread (0.0.19):
+    - React
   - SocketRocket (0.6.1)
   - Yoga (1.14.0)
 
@@ -499,6 +501,7 @@ DEPENDENCIES:
   - React-runtimescheduler (from `../node_modules/react-native/ReactCommon/react/renderer/runtimescheduler`)
   - React-utils (from `../node_modules/react-native/ReactCommon/react/utils`)
   - ReactCommon/turbomodule/core (from `../node_modules/react-native/ReactCommon`)
+  - RNThread (from `../node_modules/react-native-threads`)
   - Yoga (from `../node_modules/react-native/ReactCommon/yoga`)
 
 SPEC REPOS:
@@ -601,6 +604,8 @@ EXTERNAL SOURCES:
     :path: "../node_modules/react-native/ReactCommon/react/utils"
   ReactCommon:
     :path: "../node_modules/react-native/ReactCommon"
+  RNThread:
+    :path: "../node_modules/react-native-threads"
   Yoga:
     :path: "../node_modules/react-native/ReactCommon/yoga"
 
@@ -653,6 +658,7 @@ SPEC CHECKSUMS:
   React-runtimescheduler: f23e337008403341177fc52ee4ca94e442c17ede
   React-utils: fa59c9a3375fb6f4aeb66714fd3f7f76b43a9f16
   ReactCommon: dd03c17275c200496f346af93a7b94c53f3093a4
+  RNThread: 17c816b7eaf58871630c851948ba549f6df1c7d6
   SocketRocket: f32cd54efbe0f095c4d7594881e52619cfe80b17
   Yoga: b76f1acfda8212aa16b7e26bcce3983230c82603