yolo: add page (#9770)

pages/common/yolo.md

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+# yolo
+
+> The YOLO command line interface lets you simply train, validate or infer models on various tasks and versions.
+> More information: <https://docs.ultralytics.com/cli/>.
+
+- Create a copy of the default configuration in your current working directory:
+
+`yolo task=init`
+
+- Train the object detection, instance segment, or classification model with the specified configuration file:
+
+`yolo task={{detect|segment|classify}} mode=train cfg={{path/to/config.yaml}}`