Implement structure similar to glosario-r for define()

[ian-flores]

In glosario-r we do:

library(glosario)
define("data frame", lang = 'en')

But right now in glosario-py we do:

>>> from glosario import glosario
>>> glosario.set_language('en')
>>> glosario.define('data frame')

My proposal is for glosario-py to move to a structure similar to:

import glosario
glosario.define('data frame')

taking into consideration the class initialization that needs to happen if using the default glossary file.

[ian-flores]

Following up on what I wrote above:

In R we have it structured such that the define function first checks if it has been passed a glosario object, if not then instantiates it's own (using the default) and then uses the define method that comes with this class. This is what we need to move on here in Python as it makes for a more seamless experience.