Added build folder to solution

SimpleWavSplitter.sln

@@ -22,6 +22,16 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "shared", "shared", "{D848C9
 		src\Shared\SharedAssemblyInfo.cs = src\Shared\SharedAssemblyInfo.cs
 	EndProjectSection
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{2C2B9DE5-D2CC-4464-8660-2D2F5590C396}"
+	ProjectSection(SolutionItems) = preProject
+		.travis.yml = .travis.yml
+		appveyor.yml = appveyor.yml
+		build.cake = build.cake
+		build.ps1 = build.ps1
+		build.sh = build.sh
+		NuGet.Config = NuGet.Config
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU