Create Samples Directory with Example Code

[rmbarron]

Lots of recipe possibilities exist to grab specific information from a Deputy instance. Currently, the extent of our recipe documentation exists in docstrings of getters.

We should make these recipes more explicit, and remove ambiguity on library usage, by adding a samples directory and creating gist binaries that portray a single use case. Core examples:

• Getting users (and usernames) on shift right now.
• Getting users (and usernames) on shift at a specific time.
• Getting users (and usernames) on shift during a time window.
• Getting above information, but for specific queues by ID or name.
• Getting users with and without trainings.
• Getting queues in an instance without any of the employee information.