Feature: Documentation & Examples

[sephynox]

High Level Overview of Change

Improve interfaces for transaction models, update documentation, and provide useful examples.

Context of Change

• Added missing enum variants
• Improved model interfaces for transaction models
• Improved README documentation
• Add usage examples
• Add additional unit tests

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Tests (You added tests for code that already exists, or your new feature included in this PR)
• Documentation Updates
• Release