[Chore]: Highlight lightweight model JAR size in README #374

What

Add to the README the size of the model JAR and emphasize that it is lightweight.

Why

Making it immediately clear that the model is lightweight can help users understand its efficiency and suitability for limited resource environments, and encourage adoption.

Notes

Consider a brief section with a bold note or table that specifies the exact file size and highlights its compact nature. Link to the model JAR file if possible.