updates README.md

README.md

@@ -8,7 +8,59 @@ This module allows you to access additional display metrics on Android devices.
 
 ### Installation
 
+1. In `android/setting.gradle`
 
+    ```
+    ...
+    include ':ExtraDimensions', ':app'
+    project(':ExtraDimensions').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-extra-dimensions-android/android')
+    ```
+
+2. In `android/app/build.gradle`
+
+    ```
+    ...
+    dependencies {
+        ...
+        compile project(':ExtraDimensions')
+    }
+    ```
+
+3. Register module (in MainActivity.java)
+
+    ```
+    import ca.jaysoo.extradimensions.ExtraDimensionsPackage;  // <--- import
+
+    public class MainActivity extends Activity implements DefaultHardwareBackBtnHandler {
+      ......
+
+      @Override
+      protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mReactRootView = new ReactRootView(this);
+
+        mReactInstanceManager = ReactInstanceManager.builder()
+          .setApplication(getApplication())
+          .setBundleAssetName("index.android.bundle")
+          .setJSMainModuleName("index.android")
+          .addPackage(new MainReactPackage())
+          .addPackage(new ExtraDimensionsPackage(this))              // <------ add here
+          .setUseDeveloperSupport(BuildConfig.DEBUG)
+          .setInitialLifecycleState(LifecycleState.RESUMED)
+          .build();
+
+        mReactRootView.startReactApplication(mReactInstanceManager, "ExampleRN", null);
+
+        setContentView(mReactRootView);
+      }
+
+      ......
+
+    }
+    ```
+
+Whenever you want to use it within React Native code now you can:
+`var ExtraDimensions = require('react-native-extra-dimensions-android');`
 
 ### Demo