Updated to library

Documenting:

• Documented new functionality
• Updated the README.md

Enhancements:

• Rewritten functionality:
  • def get_doc()
  • def optimize_origin_doc()
  • def optimize_translated_doc()
  • def split_doc()
  • def join_docs()
  • def translate_docs(translatable_docs: str) -> str
• Renamed:
  • optimize_origin_doc() on optimize_doc()
  • optimize_translated_doc() on restoration_doc()
  • translate_docs() on translate_doc_segment()
• Implemented new functionality:
  • def tagging()
  • def untagging()
  • def translate_docs()
  • def start_global_translate() -> bool
• Combined all functionality into a single class - DoxDocsTranslator