minimal instructions/docstring for Trie

[mikkokotila]

I've tried to look for information on the required input parameters for Trie(bosyl, profile, main_data, custom_data) but realized that it's not contained anywhere in a single place. Could you provide minimal description for each, and some indication of recommended values for some common use-cases.

My understanding is that I can reduce overhead by loading Trie only once in my application, and then handling tokenization as I need throughout the app. As opposed to just using Text.

[10zinten]

You can create one instance of WordTokenizer and use it throughout the app.

Possible duplication of #73