* update photos's readme

projects/app_photos/README.md

@@ -1,17 +1,8 @@
-# Readme
+# README
+Displaying Images and Playing Videos
 
-The default picture path is: `/maixapp/share/picture`, you can also use `app::get_picture_path()` to get the picture path.
+## Displaying Images
+When the program starts, it will read and display images from the `/maixapp/share/picture/` directory. The program supports `jpg` and `png` image formats. It is recommended that the image resolution does not exceed `2560x1440`, and the width must be a multiple of `32`.
 
-Below is a reference for the format of saving images:
-
-```shell
-/maixapp/share/picture
-    /2024-01-02
-        0.jpg
-        1.jpg
-        2.jpg
-    /2024-02-03
-        0.jpg
-        1.jpg
-        2.jpg
-```
+## Displaying Videos
+When the program starts, it will read videos from the `/maixapp/share/video/` directory. The program supports playing, pausing, and setting the playback position. Only `mp4` videos encoded in the `H.264` format are supported. It is recommended that the video resolution does not exceed `2560x1440`, and the width must be a multiple of `32`.