Add type hints, docstrings, and improve code quality in core.py

Co-authored-by: wannaphong <8536487+wannaphong@users.noreply.github.com>

Author: Copilot

spacy_pythainlp/ __init__.py

@@ -0,0 +1,12 @@
+"""
+spaCy-PyThaiNLP: Thai language support for spaCy using PyThaiNLP.
+
+This package provides a spaCy pipeline component that integrates PyThaiNLP's
+Thai NLP capabilities, including tokenization, POS tagging, NER, sentence
+segmentation, dependency parsing, and word vectors.
+"""
+
+from spacy_pythainlp.core import PyThaiNLP
+
+__version__ = "0.1.0"
+__all__ = ["PyThaiNLP"]