Adding data science assignment files. The theme of the assignment was to calculate the semantic value of tweets based on the "happy score" of words/phrases in the AFINN-111.txt file. The twitterstream.py was pre-written and I just had to fill in my Twitter API credentials. This script created the output.txt file which was used as sample data for the other scripts which were written entirely by me. I hope this helps give you insight into my learning style.