Add solution items

Author: bording

LibGit2Sharp.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.26724.1
+VisualStudioVersion = 15.0.26730.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LibGit2Sharp", "LibGit2Sharp\LibGit2Sharp.csproj", "{EE6ED99F-CB12-4683-B055-D28FC7357A34}"
 EndProject
@@ -9,6 +9,8 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{0CA739FD-DA4D-4F64-9834-DA14A3ECD04B}"
 	ProjectSection(SolutionItems) = preProject
 		.gitignore = .gitignore
+		Directory.Build.props = Directory.Build.props
+		Directory.Build.targets = Directory.Build.targets
 		nuget.config = nuget.config
 		version.json = version.json
 	EndProjectSection