CDS Hooks guide v2 - connectathon enhancements

[mseckykoebel]

These enhancements build on the completion of #36, and include support for multi-suggestion selection per card, additional card parameters, potential feedback collection, and an improved, more readable example code layout.

[mseckykoebel]

Here is a more verbose list of the enhancements made to the v1 guide in preparation for the connectathon:

• data.js was created, which contains a data structure with the two MedicationRequest resources to be included with the actions.
• Part of the reason this was done is that it's more readable. The other reason is that this new implementation features selectionBehavior, isReccomended, and overrideReasons, which apply for cards with more than one suggestion. Before, the service returned a card suggesting that the patient be prescribed aspirin or a blood thinner based on their risk score. This new version returns a suggestion for both if their score is too high, and just the one if their score is low, meaning that the doctor may not take the suggestion for one or the other up to a certain point.
• Feedback has not been implemented but is the next area of interest.

Next steps: review, and formally testing of selectionBehavior, isReccomended, overrideReasons, and ways to collect feedback (the only thing that this does not implement). Pushing this to master will also require a change in the API guide, which is why this PR is a draft at present.