Recommendation to improve MNIST example

[xxtsxxts]

Hey,
I'm a new user to ONNXRuntime, I got some suggestion to improve MNIST sample.
1.Add Python as a prerequisite for building OnnxRuntime at https://github.com/microsoft/onnxruntime/tree/master/samples/c_cxx
2.fix bug
Please add "const OrtApi* Ort::g_api = OrtGetApiBase()->GetApi(ORT_API_VERSION);" to MNIST.cpp
https://github.com/microsoft/onnxruntime/blob/master/samples/c_cxx/MNIST/MNIST.cpp
3.Please add step "Explictly copy model.onnx into the MNIST folder to run MNIST.exe" into readme file
https://github.com/microsoft/onnxruntime/tree/master/samples/c_cxx

Thanks.

[snnn]

The second will not be needed, when ONNX Runtime 1.0 is released.

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This issue has been automatically marked as stale due to inactivity and will be closed in 7 days if no further activity occurs. If further support is needed, please provide an update and/or more details.

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