Update README with another way to install on windows

PR-URL: #1352

README.md

@@ -57,7 +57,14 @@ Install tools and configuration manually:
    * Visual C++ Build Environment:
      * Option 1: Install [Visual C++ Build Tools](http://landinghub.visualstudio.com/visual-cpp-build-tools) using the **Default Install** option.
 
-     * Option 2: Install [Visual Studio 2015](https://www.visualstudio.com/products/visual-studio-community-vs) (or modify an existing installation) and select *Common Tools for Visual C++* during setup. This also works with the free Community and Express for Desktop editions.
+     * Option 2: Install [Visual Studio 2015](https://www.visualstudio.com/products/visual-studio-community-vs) and select *Common Tools for Visual C++* during setup. This also works with the free Community and Express for Desktop editions.
+
+     * Option 3: if you already have Visual Studio 2015 installed and did not install the
+            *Common Tools for Visual C++* during setup, you can `File -> New -> Project`, pick
+            any of the options under `Templates -> Other Languages -> Visual C++` then `Ok`
+            and Visual Studio will offer to install the *Common Tools for Visual C++* with a
+            "Install Missing Features" / "You need the Universal Windows App Development Tools
+            to develop Windows app projects." dialog.
 
      > :bulb: [Windows Vista / 7 only] requires [.NET Framework 4.5.1](http://www.microsoft.com/en-us/download/details.aspx?id=40773)