Add the ability to set a default size for the cropping frame when it is displayed, and include a TextView in the cropping view that shows the size in pixels of the current cropping frame, along with other improvements

[IgnacioAusili]

First of all, I would like to express my gratitude, as I was looking for a simple image picker that met my needs, and this one is the best fit. Other image pickers I tried had issues such as being too tedious to install or implement, poor interfaces, lack of cropping options, being outdated libraries that no longer worked, or having poor cropping functionality.

On the other hand, as mentioned in the title, it would be great if you could implement the additional features I suggest. Also, there is one more detail I hadn't mentioned earlier: when adjusting the size of the cropping frame, the image zooms in or out, which is fine, but after that, you can't adjust the zoom without resizing the frame, which makes the experience somewhat unsatisfactory.

If any of my suggestions are unclear, please feel free to ask for further clarification.

Additionally, I would recommend improving the README.md and including a video demonstrating how the library works. This would be really helpful for users to better understand the functionality.

Thank you in advance for your attention, and I hope my suggestions are helpful.