Add comments and docstrings to main.py and api.py

[sweep-nightly]

Description

This PR adds comments and docstrings to the main.py and api.py files in the src directory.

Summary of Changes

src/main.py

• Added a module-level docstring explaining the purpose of the script, which is to define and train a PyTorch model for the MNIST dataset.
• Added a docstring to the Net class explaining its purpose and its methods.
• Added comments above each significant block of code to explain their functionality.
• Added inline comments to clarify any complex lines of code.

src/api.py

• Added a module-level docstring explaining the purpose of the script, which is to create an API endpoint that uses the trained model to make predictions.
• Added a docstring to the predict function explaining its functionality, parameters, and return value.
• Added comments above each significant block of code to explain their functionality.
• Added inline comments to clarify any complex lines of code.

Please review the changes and merge this PR if everything looks good.

Fixes #11.

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Rollback Files For Sweep

• Rollback changes to src/main.py
• Rollback changes to src/api.py

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• Apply: All docstrings and comments should be up to date.
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• Apply: Code should be properly commented and include docstrings for functions and classes.