example: add notebook for helloworld example

[tianweidut]

Description

demo show: https://colab.research.google.com/drive/1kdEv66fmc_msMMwrhcgb1I-VrBpHir1d#scrollTo=yMJK3vYvBlYv

Modules

• [x] Others

Checklist

• [ ] run code format and lint check
• [ ] add unit test
• [ ] add necessary doc