Add model training summary in tabular format, update requirements.txt

[Aqua-16]

Description

I have imported the tabulate module to create a tabular representation of model summary. The summary portrays the label, name and the number of images trained of different individuals.

I have also updated the requirements.txt file as required.

Related Issue

Fixes #4

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Motivation and Context

Now that a training summary is in place, it is easier to understand what data has been used to train the model. This might help us gain further insights into how our model is working.

Screenshots (if appropriate):

Checklist:

• [x] I have registered myself at Contrihub website.
• [x] My code follows the code style of this project.
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.