[notifications] First pass at notifications JS API

android/src/main/java/io/invertase/firebase/notifications/RNFirebaseNotifications.java

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+package io.invertase.firebase.notifications;
+
+import android.support.v4.app.NotificationCompat;
+
+import com.facebook.react.bridge.Promise;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+
+public class RNFirebaseNotifications extends ReactContextBaseJavaModule {
+  public RNFirebaseNotifications(ReactApplicationContext context) {
+    super(context);
+  }
+
+  @Override
+  public String getName() {
+    return "RNFirebaseNotifications";
+  }
+
+  @ReactMethod
+  public void sendNotification(Promise promise) {
+    //
+    NotificationCompat.Builder builder = new NotificationCompat.Builder()
+  }
+}

android/src/main/java/io/invertase/firebase/notifications/RNFirebaseNotificationsPackage.java

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+package io.invertase.firebase.notifications;
+
+import com.facebook.react.ReactPackage;
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.uimanager.UIManagerModule;
+import com.facebook.react.uimanager.ViewManager;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class RNFirebaseNotificationsPackage implements ReactPackage {
+  public RNFirebaseNotificationsPackage() {
+  }
+
+  /**
+   * @param reactContext react application context that can be used to create modules
+   * @return list of native modules to register with the newly created catalyst instance
+   */
+  @Override
+  public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
+    List<NativeModule> modules = new ArrayList<>();
+    modules.add(new RNFirebaseNotifications(reactContext));
+
+    return modules;
+  }
+
+  /**
+   * @param reactContext
+   * @return a list of view managers that should be registered with {@link UIManagerModule}
+   */
+  @Override
+  public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
+    return Collections.emptyList();
+  }
+}