This commit improves the README documentation for the Simple Cache project by
providing more detailed information about caching operations and available
providers. The changes aim to offer a better understanding of how Simple Cache
simplifies caching operations and enhances performance in Python applications.

- Updated the description of Simple Cache to emphasize its lightweight and
  extensible nature.
- Added a table of contents for easier navigation.
- Expanded the "Purpose" section to highlight the significance of caching in
  modern data-driven applications.
- Introduced the "Available Providers" section to showcase the DetaProvider and
  FileProvider options.
- Elaborated on the usage instructions for setting up and utilizing Simple Cache,
  including initializing providers with arguments.
- Modified the point numbering for clarity in the "Usage" section.
- Revised the decorator usage example for better understanding.
- Added a guide on cache invalidation using the set_validate function.
- Improved the documentation section layout for clarity.
- Enriched the explanations of the Decorator, DetaProvider, and FileProvider
  classes and their respective functionalities.

These enhancements aim to make Simple Cache more accessible and informative for
users, providing a comprehensive guide on utilizing caching efficiently in
Python applications.

Add `make-changelog.bat` to the `.gitignore` file.
Reason:
- This change ensures that the `make-changelog.bat` script is ignored by git.
- Keeping generated or temporary files out of version control is good practice.

This commit updates the `CHANGELOG.md` file to document the recent changes
in the project.
- Added `pytest-cov` to dev dependencies.
- Introduced a new `FileProvider` in `simple_cache.providers`.
- Updated version and functionalities in various files.
- Removed redundant code, unnecessary comments, and unused imports.
- Updated package version, methods, and project descriptions.
- Added development dependencies installation instructions.
- Added new features like the `attach` decorator and `DetaProvider` class.
- Included files for testing and mocking.
- Modified files for better functionality and clarity.
- Removed unnecessary files such as `main.py` and old test scripts.

- Update `datetime` import in DetaProvider to include `timezone` module for improved time handling.

In the DetaProvider class, the import statement for `datetime` was updated to include the `timezone` module. This change enhances the handling of time-related operations within the provider.

- Update the package version from 1.2.0 to 1.2.1.