Add sln files

Author: asizikov

src/AsyncSuffix.sln

@@ -1,10 +1,22 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 14
-VisualStudioVersion = 14.0.23107.0
+VisualStudioVersion = 14.0.25420.1
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AsyncSuffix", "AsyncSuffix\AsyncSuffix.csproj", "{752FF9EC-357F-4272-92AD-E4DAB15312C1}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "SolutionItems", "SolutionItems", "{C2FE6C03-163F-421E-8D04-45629A78094D}"
+	ProjectSection(SolutionItems) = preProject
+		..\.editorconfig = ..\.editorconfig
+		..\.gitignore = ..\.gitignore
+		..\appveyor.yml = ..\appveyor.yml
+		..\AsyncSuffix.nuspec = ..\AsyncSuffix.nuspec
+		..\build.bat = ..\build.bat
+		..\build.fsx = ..\build.fsx
+		..\GitVersion.yml = ..\GitVersion.yml
+		..\README.md = ..\README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU