a machine learning version control examples

Thanks for the original contribution from the artical Version your machine learning models with Sacred.

This example combines the tensorflow.keras job with sacred as version control and omniboard as dashboard on Platform macOS-M1.

structure

mnist_cnn.py: no sacred version control. Updated to keras module from tensorflow.
mnist_cnn_sacred.py: work with sacred. Updated to latest tensorflow and sacred setting.
mongodb-README.md : the setup of mongodb service for sacred.
omniboard-README.md : setup omniboard connection.

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