Help: Add notes for topic 'vs-windows-phone-and-store'

Help/release/dev/vs-windows-phone-and-store.rst

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+vs-windows-phone-and-store
+--------------------------
+
+* Generators for Visual Studio 11 (2012) and above learned to generate
+  projects for Windows Phone and Windows Store.  One may set the
+  :variable:`CMAKE_SYSTEM_NAME` variable to ``WindowsPhone``
+  or ``WindowsStore`` on the :manual:`cmake(1)` command-line
+  or in a :variable:`CMAKE_TOOLCHAIN_FILE` to activate these platforms.
+  Also set :variable:`CMAKE_SYSTEM_VERSION` to ``8.0`` or ``8.1`` to
+  specify the version of Windows to be targeted.