Initial commit.

Only has net-autostart in there so far, but the tags to use and
layout for it is correct, so should be reusable for the others.
Added the net-create command and a .gitignore file.
Added the net-define command.
Improved the net-autostart example in context.

Removed much of the formatting information, so the important
bits are much easier to see in the generated output.
Added the net-destroy command.
Added the net-dumpxml command.
Updated the formatting of the examples in context.
Added the net-edit command.
Added the net-list command.
Changed "Mandatory" to "Required" in the Options.  Looks better.
Added the net-name command.
Added the net-start command.
Added the net-undefine command.
Added the net-uuid command.
Typo fix.
Added "See also" heading and content to net-uuid, plus adjusted tag usage.
Added the See also heading to net-autostart.
Added the See also setting to net-create.
Added the See also heading to net-define.
Added the See also heading to net-destroy.