Add a a spanish dictionary

[franciiscocg]

We have been working on the project and my software engineering class group at the University of Seville believes that a good contribution to this project would be to add a dictionary with Spanish words to improve the reach.

[vvatanabe]

@franciiscocg Thank you for the suggestion. There is a method to add a custom dictionary from an external source. Please refer to the following for guidance. https://github.com/nulab/zxcvbn4j#customize-internal-dictionaries-and-keyboards-1