#23 Update README.md

[IlyaLisov]

PR-Codex overview

The focus of this PR is to refactor the email service by introducing a subject field in MailParameters and removing duplicate methods.

Detailed summary

• Added a subject field in MailParameters class to override default subject
• Removed duplicate send method from MailService interface and MailServiceImpl class
• Updated README.md with changes in library version and usage instructions

The following files were skipped due to too many changes: README.md

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