[demo]update readme

jrfeng · Dec 14, 2020 · 097c269 · 097c269
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diff --git a/app/readme.md b/app/readme.md
@@ -1,3 +1,7 @@
 ## Sample App
 
-This module is a sample app. Not finished yet...
+This module is a sample app. 
+
+### Preview
+
+![app preview](../picture/app_preview.png)
diff --git a/picture/app_preview.png b/picture/app_preview.png