added new nuspec file to solution

Author: Mpdreamz

src/Elasticsearch.sln

@@ -27,6 +27,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "_Build", "_Build", "{432D55
 		..\build.bat = ..\build.bat
 		..\build\build.fsx = ..\build\build.fsx
 		..\build\download-nuget.ps1 = ..\build\download-nuget.ps1
+		..\build\Elasticsearch.Net.Connection.HttpClient.nuspec = ..\build\Elasticsearch.Net.Connection.HttpClient.nuspec
 		..\build\Elasticsearch.Net.Connection.Thrift.nuspec = ..\build\Elasticsearch.Net.Connection.Thrift.nuspec
 		..\build\Elasticsearch.Net.nuspec = ..\build\Elasticsearch.Net.nuspec
 		..\build\InheritDoc.fsx = ..\build\InheritDoc.fsx