Update README(added an example)

README.md

@@ -141,7 +141,92 @@ Removes an existing download status listener.
 <br>
 
 ## Example:
-[Example project](https://github.com/SudoPlz/sp-react-native-in-app-updates/blob/v1/Example/App.tsx#L38)
+A basic working code for both types of update implementation. 
+```javascript
+import SpInAppUpdates, { IAUUpdateKind, IAUInstallStatus } from "sp-react-native-in-app-updates";
+import Snackbar from "react-native-snackbar";
+import AsyncStorage from "@react-native-async-storage/async-storage";
+
+const UPDATE_PERSISTENCE_KEY = "UPDATE_STATE";
+const FORCE_UPDATE = false; //Set it true for immediate(force) update
+const inAppUpdates = new SpInAppUpdates(
+  false, // isDebug
+);
+
+export const App = props => {
+
+  useEffect(() => {
+    const initUpdates = async () => {
+      const persitenceValue = await AsyncStorage.getItem(UPDATE_PERSISTENCE_KEY);
+      const updatesReady = persitenceValue ? JSON.parse(persitenceValue) : false;
+      inAppUpdates.addStatusUpdateListener(status => onStatusUpdate(status));
+      if (updatesReady) {
+        showSnackbar();
+      } else {
+        checkUpdateNeeded();
+      }
+    };
+    initUpdates();
+    return () => inAppUpdates.removeStatusUpdateListener(status => onStatusUpdate(status));
+  }, []);
+
+  const checkUpdateNeeded = () => {
+    inAppUpdates
+      .checkNeedsUpdate()
+      .then(result => {
+        if (result.shouldUpdate) {
+          let updateOptions = {};
+          if (Platform.OS === "android") {
+            // android only
+            updateOptions = {
+              updateType: FORCE_UPDATE ? IAUUpdateKind.IMMEDIATE : IAUUpdateKind.FLEXIBLE,
+            };
+          } else {
+            updateOptions = {
+              forceUpgrade: FORCE_UPDATE,
+            };
+          }
+          inAppUpdates.startUpdate(updateOptions);
+        }
+      })
+      .catch(err => console.log("IAU Error: ", err));
+  };
+
+  const onStatusUpdate = updateStatus => {
+    const { status } = updateStatus ?? {};
+    //On updates download
+    if (!FORCE_UPDATE && status === IAUInstallStatus.DOWNLOADED) {
+      AsyncStorage.setItem(UPDATE_PERSISTENCE_KEY, JSON.stringify(true));
+      showSnackbar();
+    }
+  };
+
+  const showSnackbar = () => {
+    Snackbar.show({
+      text: "Xyz app has downloaded an update",
+      //You can also give duration- Snackbar.LENGTH_SHORT, Snackbar.LENGTH_LONG
+      duration: Snackbar.LENGTH_INDEFINITE,
+      backgroundColor: "black",
+      textColor: "white",
+      action: {
+        text: "INSTALL",
+        textColor: "green",
+        onPress: () => {
+          installUpdates();
+        },
+      },
+    });
+  };
+
+  const installUpdates = () => {
+    AsyncStorage.setItem(UPDATE_PERSISTENCE_KEY, JSON.stringify(false));
+    inAppUpdates.installUpdate();
+  };
+
+  return <View />;
+};
+```
+[Another example project(.tsx)](https://github.com/SudoPlz/sp-react-native-in-app-updates/blob/v1/Example/App.tsx#L38)
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