Add libplist

[nikias]

Please add libplist to oss-fuzz!
My github email is not associated with any google account.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[nikias]

I signed it!

[googlebot]

CLAs look good, thanks!

[Dor1s]

Hi @nikias! Would you mind sharing who are customers of libplist project? Do you know big projects relying on it?

[nikias]

Of course, libimobiledevice depends on it, to allow communication between iOS devices and host. See http://www.libimobiledevice.org and the corresponding projects on github: https://github.com/libimobiledevice. It's part of almost every Linux distribution by now.

[nikias]

Thanks for merging! Will follow up with fuzz targets soon.