Adds the Chocolatey package as a way to install DownZemAll!

[Xav83]

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Hi @DownZemAll_devs,

I have created this Pull Request because I have resolved this request for a Chocolatey package and now, we can install downzemall using Chocolatey.

For now, only the latest version (2.5.8) is available on Chocolatey. When new versions will be released, they will, then, be added to the Chocolatey package for users to enjoy. :slightly_smiling_face:

[setvisible]

Great initiative and great job !

PS: I use Travis-CI at the moment, to prepare an upgrade, and cancelled your build by mistake. Just realized that it was your PR, not my stuff... Unintentional cancellation

Regards,