feat - improve classify to use list

[williamFalcon]

from litai import LLM

llm = LLM()
response = llm.chat('hi there')
print(response)

if llm.if_('this TV is amazing', "is this a positive review?"):
    print("👍")
else:
    print("👎")

sentiment = llm.classify("This movie was awful.", ["positive", "negative"])
print("Sentiment:", sentiment)