try to match vim syntax highlighting

[kingspride]

I am a nano user and had some trouble with the syntax highlighting, especially with comments, multiline and quotes.

I've read the issues ( #5683 ) and thought I'd try to give a little something back by matching the vim syntax highlighting file as closely as possible.

(clone of #10461 )

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[kingspride]

Thank you for your pull request. Before we can look at it, you'll need to sign a Contributor License Agreement (CLA).

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Contributors that have not signed yet: @kingspride

signed the CLA...

[bobapple]

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