doc: getting_started: Add WSL instructions

Having tried and tested building Zephyr using the standard SDK on
Windows 10 using the new WSL (Windows Subsystem for Linux), add the
documentation so that others can benefit from the functionality.

Signed-off-by: Carles Cufi <[email protected]>

Author: carlescufi

doc/getting_started/installation_win.rst

@@ -20,6 +20,9 @@ Windows system with the latest updates installed.
 Installing Requirements and Dependencies
 ****************************************
 
+Using MSYS2
+===========
+
 The Zephyr development environment on Windows relies on MSYS2, a modern UNIX
 environment for Windows. Follow the steps below to set it up:
 
@@ -176,8 +179,29 @@ environment for Windows. Follow the steps below to set it up:
     This should check that all the tools and toolchain are set up correctly for
     your own Zephyr development.
 
+Using Windows 10 WSL (Windows Subsystem for Linux)
+==================================================
+
+If you are running a recent version of Windows 10 you can make use of the
+built-in functionality to natively run Ubuntu binaries directly on a standard
+command-prompt. This allows you to install the standard Zephyr SDK and build
+for all supported architectures without the need for a Virtual Machine.
+
+#. Install Windows Subsystem for Linux (WSL) following the instructions on the
+   official Microsoft website: `WSL Installation`_
+
+   .. note::
+         For the Zephyr SDK to function properly you will need Windows 10
+         build 15002 or greater. You can check which Windows 10 build you are
+         running in the "About your PC" section of the System Settings.
+         If you are running an older Windows 10 build you might need to install
+         the Creator's Update.
+
+#. Follow the instructions for Ubuntu detailed in the Zephyr Linux Getting
+   Started Guide which can be found here: :ref:`installation_linux`
 
 .. _GNU ARM Embedded: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads
 .. _MSYS2 website: http://www.msys2.org/
 .. _ISSM Toolchain: https://software.intel.com/en-us/articles/issm-toolchain-only-download
 .. _Getting Started on Arduino 101 with ISSM: https://software.intel.com/en-us/articles/getting-started-arduino-101genuino-101-with-intel-system-studio-for-microcontrollers
+.. _WSL Installation: https://msdn.microsoft.com/en-us/commandline/wsl/install_guide