Update Docs re: password

[johnmccrae]

Version:

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Environment: [Details about the environment such as the Operating System, cookbook details, etc...]

Scenario:

The documentation in the Readme is misleading. The transport parameter of 'password' maps to the local administrator account on the target node. The docs should reflect that. It's not even remotely obvious what account that maps to; especially if you have been using vagrant for your local VM work. I had incorrectly assumed it wanted my vagrant user password but only after using kitchen -l debug was I able to figure out the correct account. The other piece that should be noted is that the local administrator account on any windows system is disabled by default and must be enabled and have the password you just specified assigned to it.

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Expected Result:

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Actual Result:

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