Create an example around logging a food item

[whazzmaster]

We'd like an example on how to log food items via fitgem.

The main consideration for this hypothetical example is whether we'd plumb out the ability to search for an food item (in order to acquire the foodId) or if we'd just hard-code a food to use as a sample. It would be more helpful to allow the user to search for an food by name. Maybe look into using select2 to do the live search with a pass-through to the fitbit service.