[Doc] Update Image classification offloading docs

This patch updated docs and screenshots for image classification offloading example.

Signed-off-by: Yelin Jeong <yelini.jeong@samsung.com>

Author: niley7464

Tizen.web/ImageClassificationOffloading/README.md

@@ -3,6 +3,9 @@
 * This is a sample application of Tizen ML Web APIs.
 * If you want to run it on your device, Tizen 8.0 or higher is required.
 * `appsrc` and `tensor_query_client` element are used.
+* You need to connect `tensor_query_server` to the same Wi-Fi network or ethernet.
+* Sample server application is [here](https://github.com/nnstreamer/nnstreamer-android/tree/main/ml_inference_offloading).
+* Here's a [guide](https://github.com/nnstreamer/nnstreamer-android/blob/main/documentation/getting_started.md#building-the-tizen-web-app) on how to build.
 
 ## Demo
 ![Alt demo](./image_classification_offloading.png)