Add a README to queue/; mod comment in queue.h.

data_structures/queue/README.md
	-Add a README to the `queue/` project. Explain what it
	implements, describe valid `make` targets, and provide an
	example of inclusion and usage in another C file.

data_structures/queue/src/queue.h
	-Remove all the trailing asterisks from the documentation
	comment for `printQueue()` and indent its contents, in
	keeping with the style of all the other comments in the file.