Logging Capability (#53)

* Logging Capability

* Readability

* Redundant using

---------

Co-authored-by: Stephen Toub <stoub@microsoft.com>

src/ModelContextProtocol/Protocol/Types/LoggingMessageNotificationParams.cs

@@ -0,0 +1,31 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol.Types;
+
+/// <summary>
+/// Sent from the server as the payload of "notifications/message" notifications whenever a log message is generated.
+/// 
+/// If no logging/setLevel request has been sent from the client, the server MAY decide which messages to send automatically.
+/// <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/2024-11-05/schema.json">See the schema for details</see>
+/// </summary>
+public class LoggingMessageNotificationParams
+{
+    /// <summary>
+    /// The severity of this log message.
+    /// </summary>
+    [JsonPropertyName("level")]
+    public LoggingLevel Level { get; init; }
+
+    /// <summary>
+    /// An optional name of the logger issuing this message.
+    /// </summary>
+    [JsonPropertyName("logger")]
+    public string? Logger { get; init; }
+
+    /// <summary>
+    /// The data to be logged, such as a string message or an object. Any JSON serializable type is allowed here.
+    /// </summary>
+    [JsonPropertyName("data")]
+    public JsonElement? Data { get; init; }
+}