Add MediaType for Microsoft Outlook

[Tomschi]

No description provided.

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[Tomschi]

I signed it!

[googlebot]

CLAs look good, thanks!

[kluever]

For new MediaTypes, we're trying to make sure we have well-formed javadocs and canonical links to explanations/definitions. Can you find a good reference link for this media type?

[Tomschi]

I found this:
https://www.loc.gov/preservation/digital/formats/fdd/fdd000379.shtml

Is this reference ok?

[kluever]

Looks good - I'll get this submitted internally and mirrored out.