[Feature Request]: Adding new words to dictionary

[patmull]

Thanks for this great tool for lemmatization of words. If you plan to continue in this project, it would be nice to have an ability to add "manually" words to dictionary.

For example:

morph = majka.Majka('morphological_database/majka.w-lt')
new_tags = {gender': 'femine',
           'plural': False,
           'pos': 'noun'}
morph.add(words=["Sněžce","Sněžkou"],lemma="Sněžka",lemma_diacritics_free='snezka',tags=new_tags)

Thanks for consideration.