provisional work to support sln level config files

src/WarnAboutTODOs.Vsix/source.extension.cs

@@ -11,7 +11,7 @@ internal sealed partial class Vsix
         public const string Name = "Warn About TODOs";
         public const string Description = @"Displays warnings for TODO notes in comments";
         public const string Language = "en-US";
-        public const string Version = "1.7.3";
+        public const string Version = "1.7.3.0";
         public const string Author = "Matt Lacey";
         public const string Tags = "";
     }

src/WarnAboutTODOs.Vsix/source.extension.vsixmanifest

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PackageManifest Version="2.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2011" xmlns:d="http://schemas.microsoft.com/developer/vsx-schema-design/2011">
     <Metadata>
-        <Identity Id="WarnAboutTODOs.c50458a5-b99a-484f-be10-f1a8714c1453" Version="1.7.3" Language="en-US" Publisher="Matt Lacey"/>
+        <Identity Id="WarnAboutTODOs.c50458a5-b99a-484f-be10-f1a8714c1453" Version="1.7.3.0" Language="en-US" Publisher="Matt Lacey"/>
         <DisplayName>Warn About TODOs</DisplayName>
         <Description xml:space="preserve">Displays warnings for TODO notes in comments</Description>
         <MoreInfo>https://github.com/mrlacey/WarnAboutTodos</MoreInfo>

src/WarnAboutTODOs/SolutionConfigFile.cs

@@ -0,0 +1,31 @@
+// <copyright file="UserConfigFile.cs" company="Matt Lacey Ltd.">
+// Copyright (c) Matt Lacey Ltd. All rights reserved.
+// </copyright>
+
+using System.IO;
+using System.Threading;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+
+namespace WarnAboutTODOs
+{
+	internal class SolutionConfigFile : AdditionalText
+	{
+		private SolutionConfigFile(string path)
+		{
+			this.Path = path;
+		}
+
+		public override string Path { get; }
+
+		public static SolutionConfigFile FromFilePath(string configFileName)
+		{
+			return File.Exists(configFileName) ? new SolutionConfigFile(configFileName) : null;
+		}
+
+		public override SourceText GetText(CancellationToken cancellationToken = default(CancellationToken))
+		{
+			return SourceText.From(File.ReadAllText(this.Path));
+		}
+	}
+}