Move green flag test to containers directory to make it clearer it's testing the container and not the component.

- Add documentation on how to run tests.

WIP getting a react test working. Throws syntax error on svgs so need to maybe configure jest to use existing webpack config instead which probably properly handles svgs.
- added additional plugins to get tests working

\o/ Successfully got hello world of jest working on windows (in windows cmd line). For some reason git bash doesn't work.