Add README to solution items

***NO_CI***

Author: josesimoes

nanoFramework.Azure.Devices.Client.sln

@@ -23,6 +23,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		.runsettings = .runsettings
 		nanoFramework.Azure.Devices.Client.FullyManaged.nuspec = nanoFramework.Azure.Devices.Client.FullyManaged.nuspec
 		nanoFramework.Azure.Devices.Client.nuspec = nanoFramework.Azure.Devices.Client.nuspec
+		README.md = README.md
 		version.json = version.json
 	EndProjectSection
 EndProject