Update README.md

Author: WongKinYiu

README.md

@@ -20,6 +20,7 @@ MS COCO
 
 | Model | Test Size | AP<sup>val</sup> | AP<sub>50</sub><sup>val</sup> | AP<sub>75</sub><sup>val</sup> | Param. | FLOPs |
 | :-- | :-: | :-: | :-: | :-: | :-: | :-: |
+| [**YOLOv9-N (dev)**]() | 640 | **38.3%** | **53.1%** | **41.3%** | **2.0M** | **7.7G** |
 | [**YOLOv9-S**]() | 640 | **46.8%** | **63.4%** | **50.7%** | **7.1M** | **26.4G** |
 | [**YOLOv9-M**]() | 640 | **51.4%** | **68.1%** | **56.1%** | **20.0M** | **76.3G** |
 | [**YOLOv9-C**](https://github.com/WongKinYiu/yolov9/releases/download/v0.1/yolov9-c-converted.pt) | 640 | **53.0%** | **70.2%** | **57.8%** | **25.3M** | **102.1G** |