Add vcpkg installation instructions (#970)
Add vcpkg installation instructions (#970)

Summary:
Yoga is available as a port in VCPKG , documenting the install process here will help users get started by providing a single set of commands to build yoga, ready to be included in their projects.

VCPKG is a C++ library manager that simplifies installation for yoga and other project dependencies, we also test whether our library ports build in various configurations (dynamic, static) on various platforms (OSX, Linux, Windows: x86, x64, UWP, ARM) to keep a wide coverage for users.

I'm a maintainer for vcpkg, and here is what the port script looks like. We try to keep the library maintained as close as possible to the original library.

Pull Request resolved: https://github.com/facebook/yoga/pull/970

Reviewed By: yungsters

Differential Revision: D40027569

Pulled By: yungsters

fbshipit-source-id: ca9a6aa481c7b46e96c5937fe3cc7b716e464e4d

facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga