Added easy access to common solution-level files.

Author: brian-reichle

src/TextTools.sln

@@ -3,6 +3,13 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.0.32014.148
 MinimumVisualStudioVersion = 10.0.40219.1
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "_Solution_", "_Solution_", "{36859437-C7AB-43C0-8B40-05AC486AA2FF}"
+	ProjectSection(SolutionItems) = preProject
+		..\.editorconfig = ..\.editorconfig
+		..\Directory.Build.props = ..\Directory.Build.props
+		..\Directory.Packages.props = ..\Directory.Packages.props
+	EndProjectSection
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TextTools", "TextTools\TextTools.csproj", "{EF1A35D6-BDBB-4C28-8B52-4CD9136AC2D3}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TextTools.Test", "TextTools.Test\TextTools.Test.csproj", "{835036C8-8934-4CC8-863B-021EFA812EBE}"