Resource capability (#5)

Prompt capability
Pagination support

src/mcpdotnet/Protocol/Messages/NotificationMethods.cs

@@ -0,0 +1,27 @@
+namespace McpDotNet.Protocol.Messages;
+
+/// <summary>
+/// A class containing constants for notification methods.
+/// </summary>
+public static class NotificationMethods
+{
+    /// <summary>
+    /// Sent by the server when the list of tools changes.
+    /// </summary>
+    public const string ToolListChangedNotification = "notifications/tools/list_changed";
+
+    /// <summary>
+    /// Sent by the server when the list of prompts changes.
+    /// </summary>
+    public const string PromptsListChanged = "notifications/prompts/list_changed";
+
+    /// <summary>
+    /// Sent by the server when the list of resources changes.
+    /// </summary>
+    public const string ResourceListChangedNotification = "notifications/resources/list_changed";
+
+    /// <summary>
+    /// Sent by the server when a resource is updated.
+    /// </summary>
+    public const string ResourceUpdatedNotification = "notifications/resources/updated";
+}