Add served web demo for the imageviewer (#5116)

examples/imageviewer/README.md

@@ -1,7 +1,11 @@
 # Imageviewer
 
 An example of an image gallery with camera and map support
-based on Compose Multiplatform (desktop, Android and iOS).
+based on Compose Multiplatform (desktop, Web, Android and iOS).
+
+[![Static Badge](https://img.shields.io/badge/online%20demo%20%F0%9F%9A%80-6b57ff?style=for-the-badge)](https://zal.im/wasm/iv).
+
+![](screenshots/imageviewer.png)
 
 ## Setting up your development environment
 
@@ -29,6 +33,10 @@ Choose a run configuration for an appropriate target in IDE and run it.
 
 ## Run on Web via Gradle
 
+> **Note:**
+> Web support is in [Alpha](https://kotlinlang.org/docs/components-stability.html). It may be changed at any time. You can use it in scenarios before production.
+> We would appreciate your feedback in [GitHub](https://github.com/JetBrains/compose-multiplatform/issues).
+
 `./gradlew :webApp:wasmJsRun`
 
 ### Running Android application