Digiseller-api-python

- Added all missing API methods from the "Operations"
- Fixing bugs and adding checks
- Updating the description

**Full Changelog**: https://github.com/Ernieleo/digiseller-api-python/compare/v2.1.0...v2.2.0

- Added all missing API methods
- In the code added comments () for each method containing names from Digiseller documentation in English and Russian.
- Added work with content-type 'Image/...'

**Planned**: Future plans include creating documentation for easy and correct use.

**Full Changelog**: https://github.com/Ernieleo/digiseller-api-python/compare/v2.0.0...v2.1.0

**Overview:**
This release introduces version 2.1.0 of the Digiseller API Python library.
The library provides convenient access to the Digiseller API, allowing users to interact with the Digiseller platform directly from Python.

- Updated code structure and fixed bugs.
- Added support for several previously missing API methods. Each method is labeled directly in the code with a comment () with a name identical to the Digiseller documentation to match the official Digiseller API documentation and to be able to find the method.
- An example of using API functions has been implemented.

**Planned**: Future plans include creating documentation for easy and correct use.

**Full Changelog**: https://github.com/Ernieleo/digiseller-api-python/commits/v2.0.0

**Overview:**
This release introduces version 2 of the Digiseller API Python library.
The library provides convenient access to the Digiseller API, allowing users to interact with the Digiseller platform directly from Python.