Add articles on logging and progress (#717)

* Add articles on logging and progress
* Address comments in PR review

docs/concepts/progress/samples/server/Tools/LongRunningTools.cs

@@ -0,0 +1,44 @@
+using System.ComponentModel;
+using ModelContextProtocol;
+using ModelContextProtocol.Protocol;
+using ModelContextProtocol.Server;
+
+namespace Progress.Tools;
+
+[McpServerToolType]
+public class LongRunningTools
+{
+    [McpServerTool, Description("Demonstrates a long running tool with progress updates")]
+    public static async Task<string> LongRunningTool(
+        IMcpServer server,
+        RequestContext<CallToolRequestParams> context,
+        int duration = 10,
+        int steps = 5)
+    {
+        var progressToken = context.Params?.ProgressToken;
+        var stepDuration = duration / steps;
+
+        for (int i = 1; i <= steps; i++)
+        {
+            await Task.Delay(stepDuration * 1000);
+
+            // <snippet_SendProgress >
+            if (progressToken is not null)
+            {
+                await server.SendNotificationAsync("notifications/progress", new ProgressNotificationParams
+                {
+                    ProgressToken = progressToken.Value,
+                    Progress = new ProgressNotificationValue
+                    {
+                        Progress = i,
+                        Total = steps,
+                        Message = $"Step {i} of {steps} completed.",
+                    },
+                });
+            }
+            // </snippet_SendProgress >
+        }
+
+        return $"Long running tool completed. Duration: {duration} seconds. Steps: {steps}.";
+    }
+}