Add PG.StarWarsGame.Engine.FileSystem project to solution

Author: AnakinRaW

ModVerify.slnx

@@ -17,6 +17,7 @@
     <Project Path="modules/ModdingToolBase/src/Updater/ExternalUpdater.Core/ExternalUpdater.Core.csproj" />
   </Folder>
   <Folder Name="/PetroglyphTools/">
+    <Project Path="src/PetroglyphTools/PG.StarWarsGame.Engine.FileSystem/PG.StarWarsGame.Engine.FileSystem.csproj" />
     <Project Path="src/PetroglyphTools/PG.StarWarsGame.Engine/PG.StarWarsGame.Engine.csproj" />
     <Project Path="src/PetroglyphTools/PG.StarWarsGame.Files.ALO/PG.StarWarsGame.Files.ALO.csproj" />
     <Project Path="src/PetroglyphTools/PG.StarWarsGame.Files.ChunkFiles/PG.StarWarsGame.Files.ChunkFiles.csproj" />