doc: add arm64 components to MSVC setup instructions

In order to successfully build a native module for ARM64 Node.js, the
Visual Studio installation in question needs extra ARM64-specific
components added. This change adds the names of these components to
README.md.

README.md

@@ -49,7 +49,7 @@ Install all the required tools and configurations using Microsoft's [windows-bui
 Install tools and configuration manually:
    * Install Visual C++ Build Environment: [Visual Studio Build Tools](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools)
    (using "Visual C++ build tools" workload) or [Visual Studio 2017 Community](https://visualstudio.microsoft.com/pl/thank-you-downloading-visual-studio/?sku=Community)
-   (using the "Desktop development with C++" workload)
+   (using the "Desktop development with C++" workload plus the components "Visual C++ compilers and libraries for ARM64" and "Visual C++ ATL for ARM64")
    * Install [Python 2.7](https://www.python.org/downloads/) (`v3.x.x` is not supported), and run `npm config set python python2.7` (or see below for further instructions on specifying the proper Python version and path.)
    * Launch cmd, `npm config set msvs_version 2017`