add the sys.path way to help finding the dinov2 in using VSCODE

[CorleoneJW]

In ubuntu 22.04 OS, "No module named 'dinov2'" would be happen if you run the train.py in /dinov2/run/train, I found that some people asked about it in issue, using the sys.path.append to add the path could help the interpreter to find the right "dinov2" and fix the error mentioned before.

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