[wip] Add section for part-of-speech tagging

[viswavi]

Currently, have just moved the HW1 code from CMU's 11-737 course in here.

In the future, we will:

• Add detailed instructions and best practices for improving performance beyond these baselines
• Add flags to make it easier to try different configuration settings
• Make the code more readable and modular
• Consider adding other models like Udify or Stanza
• Consider adding morphological analysis into this section