Add xscgen-proj to solution

Fix NuGet versioning bug

XmlSchemaClassGenerator.sln

@@ -18,6 +18,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
  README.md = README.md
  EndProjectSection
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "xscgen-proj", "xscgen-proj\xscgen-proj.csproj", "{2F20FF02-12AB-448B-BC78-DD76DD4C9E66}"
+EndProject
 Global
  GlobalSection(SolutionConfigurationPlatforms) = preSolution
  Debug|Any CPU = Debug|Any CPU
@@ -44,6 +46,10 @@ Global
  {C5C1FF7F-31AD-4D4F-81F3-C9F54516D9D0}.Debug|Any CPU.Build.0 = Debug|Any CPU
  {C5C1FF7F-31AD-4D4F-81F3-C9F54516D9D0}.Release|Any CPU.ActiveCfg = Release|Any CPU
  {C5C1FF7F-31AD-4D4F-81F3-C9F54516D9D0}.Release|Any CPU.Build.0 = Release|Any CPU
+ {2F20FF02-12AB-448B-BC78-DD76DD4C9E66}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {2F20FF02-12AB-448B-BC78-DD76DD4C9E66}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {2F20FF02-12AB-448B-BC78-DD76DD4C9E66}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {2F20FF02-12AB-448B-BC78-DD76DD4C9E66}.Release|Any CPU.Build.0 = Release|Any CPU
  EndGlobalSection
  GlobalSection(SolutionProperties) = preSolution
  HideSolutionNode = FALSE

xscgen-proj/xscgen-proj.csproj

@@ -5,7 +5,7 @@
  <Description>A .NET Core CLI tool to generate XmlSerializer compatible C# classes from XML Schema files.</Description>
  <Copyright>Copyright 2013-2018 Michael Ganss</Copyright>
  <AssemblyTitle>xscgen</AssemblyTitle>
- <VersionPrefix>1.0.0</VersionPrefix>
+ <VersionPrefix>1.0.0-VERSION</VersionPrefix>
  <AssemblyName>dotnet-xscgen</AssemblyName>
  <RootNamespace>XmlSchemaClassGenerator.Console</RootNamespace>
  <Authors>Michael Ganss</Authors>