Add example of python code to readme of transformers tools (#3966)
Add example of python code to readme of transformers tools (#3966)

* Use shorter name for tools
* Use optimizer_cli
* Add comments about -i parameter
microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime