Zoom Handling on Android

https://www.raylib.com/examples/core/loader.html?name=core_input_gestures

After coming across this example, I guess it's an easy task


```cxx
  case GESTURE_PINCH_IN: TextCopy(gestureStrings[gesturesCount], "GESTURE PINCH IN"); break;
                    case GESTURE_PINCH_OUT: TextCopy(gestureStrings[gesturesCount], "GESTURE PINCH OUT"); break;
```


These lines are of interest for this task.