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nodes/record/README.md

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+# Summary
+
+`vp_record_node` is used to record video and image, save them to local disk after it finished. It's a middle node but works asynchronously, so recording would not block the pipeline.
+
+```
+record
+ ┣ README.md
+ ┣ vp_image_record_task.cpp
+ ┣ vp_image_record_task.h   // image record task
+ ┣ vp_record_node.cpp
+ ┣ vp_record_node.h   // record node
+ ┣ vp_record_task.cpp
+ ┣ vp_record_task.h   // base class for record task, work async
+ ┣ vp_video_record_task.cpp
+ ┗ vp_video_record_task.h   // video record task
+```
+
+below is showing how to record video:
+
+![](../../doc/p5.png)