Add a Jupyter Notebook example

Author: yushulx

examples/official/9.x/jupyter_notebook/README.md

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+# Jupyter Notebook Barcode Scanning
+[![](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/15BcSjEclq7MgTgfEYzzBg43QdmXbvFGg#scrollTo=ffcaf90c)
+
+This Jupyter Notebook demonstrates how to scan barcode images using the [Dynamsoft Barcode Reader](https://www.dynamsoft.com/barcode-reader/docs/server/programming/python/).
+
+![Jupyter notebook: barcode scanning](https://www.dynamsoft.com/codepool/img/2021/12/jupyter-notebook-barcode-scanning.png)
+
+## Blog
+[How to Scan Barcodes in Jupyter Notebook](https://www.dynamsoft.com/codepool/jupyter-notebook-barcode-scanning.html)
+
+