chore: readme update

README.md

@@ -1,31 +1,95 @@
 # @getivy/react-native-sdk
 
-Getivy SDK for React Native
+# Getting Started
 
-## Installation
+- Installation
+- Usage
 
-```sh
+## Step 1: Installation
+
+Add the module to your react native project by executing:
+
+```bash
+# using npm
 npm install @getivy/react-native-sdk
+
+# OR using Yarn
+yarn add @getivy/react-native-sdk
+```
+
+Create a personal Github access token with permission _read:packages_ and add the following in your Android application root _build.gradle_ file:
+
+```
+allprojects {
+        repositories {
+            maven {
+                name = "GitHub"
+                url = uri("https://maven.pkg.github.com/getivy/android-sdk-public")
+                credentials {
+                    username = <Github_username>
+                    password = <Github_token>
+                }
+            }
+        }
+    }
 ```
 
-## Usage
+Even though the Maven repository is public, Github requires this to be able to get the package.
 
-```js
-import { multiply } from '@getivy/react-native-sdk';
+## Step 2: Usage
 
-// ...
+Import the package:
 
-const result = await multiply(3, 7);
 ```
+import * as GetivySDK from '@getivy/react-native-sdk';
+```
+
+Initialize the SDK with data session or checkout session id and environment:
 
-## Contributing
+```
+// Data session
+GetivySDK.initializeDataSession(dataSessionId, "production");
+```
 
-See the [contributing guide](CONTRIBUTING.md) to learn how to contribute to the repository and the development workflow.
+```
+// Checkout session
+GetivySDK.initializeCheckoutSession(checkoutSessionId, "sandbox");
+```
 
-## License
+Possible environment values: _production_ and _sandbox_
 
-MIT
+Open SDK UI:
+
+```
+GetivySDK.openSDK();
+```
+
+It will open a modal view on top of your application in iOS, and new activity in Android.
+
+Listen for SDK events:
+
+```
+import { NativeEventEmitter } from 'react-native';
+
+// Component implementation
+
+useEffect(() => {
+    const eventEmitter = new NativeEventEmitter(eventsEmitter);
+    const onSuccess = eventEmitter.addListener('onSuccess', (eventData) => {
+      Alert.alert('Success', JSON.stringify(eventData));
+    });
+
+    const onError = eventEmitter.addListener('onError', (eventData) => {
+      Alert.alert('Error', JSON.stringify(eventData));
+    });
+
+    return () => {
+      onSuccess.remove();
+      onError.remove();
+    };
+  }, []);
+```
 
----
+While going through SDK, closing, succeeding to pay or failing, events will be delivered by the listeners.
 
-Made with [create-react-native-library](https://github.com/callstack/react-native-builder-bob)
+Refer to the _example_ application for more indepth usage example.