addListener and removeListeners methods wass added to pass warning

Author: Enderdroid

android/src/main/java/com/rnfs/RNFSManager.java

@@ -949,6 +949,17 @@ public void onScanCompleted(String path, Uri uri) {
     );
   }
 
+  // Required for rn built in EventEmitter Calls.
+  @ReactMethod
+  public void addListener(String eventName) {
+
+  }
+
+  @ReactMethod
+  public void removeListeners(Integer count) {
+
+  }
+
   private void reject(Promise promise, String filepath, Exception ex) {
     if (ex instanceof FileNotFoundException) {
       rejectFileNotFound(promise, filepath);