Update ai-server cs examples.

Author: Layoric

MyApp/_includes/ai-server/cs/queue-trim-video-1.cs.md

@@ -0,0 +1,23 @@
+```csharp
+        var request = new QueueTrimVideo
+        {
+            StartTime = "00:05",
+            EndTime = "00:10"
+        };
+
+        var response = client.PostFilesWithRequest<QueueMediaTransformResponse>(
+            request,
+            [new UploadFile("test_video.mp4", File.OpenRead("files/test_video.mp4"), "video")]
+        );
+
+        var status = await client.GetAsync(new GetJobStatus { RefId = response.RefId });
+        while (status.JobState is BackgroundJobState.Started or BackgroundJobState.Queued)
+        {
+            await Task.Delay(1000);
+            status = await client.GetAsync(new GetJobStatus { RefId = response.RefId });
+        }
+
+        // Download the trimmed video
+        var videoUrl = status.Outputs[0].Url;
+        videoUrl.DownloadFileTo($"trimmed-video-{status.RefId}.mp4");
+```

MyApp/_includes/ai-server/cs/trim-video-1.cs.md

@@ -0,0 +1,15 @@
+```csharp
+        var request = new TrimVideo
+        {
+            StartTime = "00:05",
+            EndTime = "00:10"
+        };
+
+        var response = client.PostFilesWithRequest<MediaTransformResponse>(
+            request,
+            [new UploadFile("test_video.mp4", File.OpenRead("files/test_video.mp4"), "video")]
+        );
+
+        var videoUrl = response.Outputs[0].Url;
+        videoUrl.DownloadFileTo(outputFileName);
+```