Adding a master properties file to control the version of the package (#270)

custom.props

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Label="Version">
+    <VersionMajor>0</VersionMajor>
+    <VersionMinor>15</VersionMinor>
+    <!-- The nuget package version should be incremented when we produce QFEs -->
+    <NuGetPackVersion>0.15.0</NuGetPackVersion>
+    <VersionInfoProductName>WinSDKFB</VersionInfoProductName>
+  </PropertyGroup>
+</Project>