Add topics for all exercises in preparation for Nexercism

[ilya-khadykin]

Version 2.0 of Exercim will utilize the topics heavily, so I strongly suggest adding them to all exercises in your config.json

Please note that we are trying to be consistent between tracks and decided to use snake_case for topics.
You can find list of topics here - https://github.com/exercism/problem-specifications/blob/master/TOPICS.txt
Fill free to add something if needed

[bdw429s]

Topics (from the file linked above) should be added as an array of strings in the topics key of each exercise in this file:
https://github.com/exercism/cfml/blob/master/config.json