[Proposal] Add "docker commit" to "Interacting with running containers" section

[rubensa]

The commit command is useful to interactively create an image.

See official doc: https://docs.docker.com/engine/reference/commandline/commit/

Some thing like:

$ docker commit [<opts>] <container> [<repository> [<:tag>]]
 			Create a new image from a container’s changes
	-a, --author 	Author (e.g., “John Hannibal Smith hannibal@a-team.com”)
	-c, --change	Apply Dockerfile instruction to the created image
	-m, --message	Commit message
	-p, --pause	Pause container during commit