Document Vulkan Info for iOS
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Note: In order to review and/or save the output produced when using Visual Studio execute `vulkaninfo` with the JSON option, you will have to redirect output to a file by modifying the command line arguments in the debug options.
Note: The Vulkan Info binary found in the Vulkan SDK is renamed to `vulkaninfoSDK.exe`. This was done to demark any Vulkan Info version installed by the Vulkan Runtime Package, which is from an IHV distribution. When using command line on Windows, the Vulkan info version used will be from the IHV distribution, not the SDK. To run the SDK version, either use the start menu shortcuts or navigate to the `VulkanSDK/Bin` directory and run `vulkaninfoSDK.exe` directly.
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+### iOS Devices
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+Vulkan Info is now avaialble for iOS devices, but must be built manually.
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+The Vulkan Info project contains a folder at [vulkaninfo/ios](https://github.com/KhronosGroup/Vulkan-Tools/tree/master/vulkaninfo/iOS) that contains an XCode project that will build Vulkan Info for iOS devices. In order to deploy to an iOS device, the developer must be a member of the [Apple Developer Program](https://developer.apple.com/programs/). In addition, Vulkan Info makes use of the [MoltenVK](https://github.com/KhronosGroup/MoltenVK) libraries, which is a seperate project from Vulkan-Tools and you will need to add the MoltenVK libraries to your XCode project manually. See the [LunarG Getting Started with the macOS SDK](https://vulkan.lunarg.com/doc/sdk/latest/mac/getting_started.html) guide for more information about using MoltenVK in the Vulkan SDK.
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+When Vulkan Info is run on an iOS device, it will create the standard vulkaninfo.json file and also a portability.json file. An HTML file is also created, and is displayed in a webview on the iOS device when the application is run. These files are located on the iOS device, and are available via the [iOS application file sharing mechanism](https://support.apple.com/en-us/HT201301) via iTunes for Windows or macOS. You can also access these files using the macOS Finder or Windows Explorer when the device is attached to the host computer via a USB cable. Select the device, and navigate to the "vulkaninfo" folder to access these files. There is currently no supported means to access these files on an iOS device from a Linux host computer.
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