Populate README. #2

Theese are the following things I want to include within the README:

• Background info (About HyperTest)
• Usage (How to build and use)
• Contributing (How to contribute)
• How to test (A better place for this might be github's wiki feature but I feel like adding extensive information about how I think testing should be done and samples of how to perform those tests may be more benefitial in the readme itself.
• ...