models: Make a list of models to be added and create a road map

[programmer290399]

TODO:

• Curate a list of models that should be added
• Make a roadmap for implementation of those models

[programmer290399]

Allen NLP has a good collection of models and should be considered as a candidate: https://docs.allennlp.org/main/

[programmer290399]

https://github.com/abhishekkrthakur/chaii-hindi-tamil-question-answering