def register_domain(self, domain=<NUM_LIT:0>, tokenizer=None, trie=None):
self.domains[domain] = IntentDeterminationEngine(<EOL>tokenizer=tokenizer, trie=trie)<EOL>
Register a domain with the intent engine.

Args:
    tokenizer(tokenizer): The tokenizer you wish to use.
    trie(Trie): the Trie() you wish to use.
    domain(str): a string representing the domain you wish to add