docs: add opsfile descriptions
docs: add opsfile descriptions

still a work in progress but some docs are better than no docs!
¯\_(ツ)_/¯

[#171366362](https://www.pivotaltracker.com/story/show/171366362)

Co-authored-by: Aidan Obley <2667fa8e8663c9d9f622cbe0896041b5635a919f@pivotal.io>

cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release