Create a 'now what' part to the README

[chrisvanrun]

It seems like some orgs are first changing the examples, and only then trying to upload them. Not having an initial successful path can frustrate further progress in getting a challenge started.

After having received the challenge pack, the orgs should really:

• Manually upload a single case (or three for the debug phase?)
• Try and run the test scripts
• Save eval method, and upload it
• Save the algorithm, and upload it

That way they have a working understanding of the process and when they break something, they know it used to work.