Add types for response deserialisation

Author: stevejgordon

src/Elasticsearch.Net/Responses/RootPath/BuildVersion.cs

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+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using System.Runtime.Serialization;
+
+namespace Elasticsearch.Net
+{
+	/// <summary>
+	/// Information about the build version.
+	/// </summary>
+	internal class BuildVersion
+	{
+		/// <summary>
+		/// The SemVer version number, which may include pre-release labels.
+		/// </summary>
+		[DataMember(Name = "number")]
+		public string Number { get; set; }
+
+		/// <summary>
+		/// The flavor of the build.
+		/// </summary>
+		[DataMember(Name = "build_flavor")]
+		public string BuildFlavor { get; set; }
+	}
+}

src/Elasticsearch.Net/Responses/RootPath/RootResponse.cs

@@ -0,0 +1,26 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using System.Runtime.Serialization;
+
+namespace Elasticsearch.Net
+{
+	/// <summary>
+	/// Represents the response from a call to the root path of an Elasticsearch server.
+	/// </summary>
+	internal class RootResponse : ElasticsearchResponseBase
+	{
+		/// <summary>
+		/// The build version information of the product.
+		/// </summary>
+		[DataMember(Name = "version")]
+		public BuildVersion Version { get; set; }
+
+		/// <summary>
+		/// The tagline of the product.
+		/// </summary>
+		[DataMember(Name = "tagline")]
+		public string Tagline { get; set; }
+	}
+}