Add Directory.Packages.props to solution.

Renci.SshNet.sln

@@ -14,6 +14,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		CODEOWNERS = CODEOWNERS
 		CONTRIBUTING.md = CONTRIBUTING.md
 		Directory.Build.props = Directory.Build.props
+		Directory.Packages.props = Directory.Packages.props
 		global.json = global.json
 		LICENSE = LICENSE
 		nuget.config = nuget.config