[docs] Set up documentation structure with API reference

docs/source/index.rst

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+.. TexTeller documentation master file, created by
+   sphinx-quickstart on Sun Apr 20 13:05:53 2025.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+TexTeller Documentation
+===========================================
+
+Features
+--------
+
+- **Image to LaTeX Conversion**: Convert images containing LaTeX formulas to LaTeX code
+- **LaTeX Detection**: Detect and locate LaTeX formulas in mixed text/formula images
+- **Paragraph to Markdown**: Convert mixed text and formula images to Markdown format
+
+Installation
+-----------
+
+You can install TexTeller using pip:
+
+.. code-block:: bash
+
+   pip install texteller
+
+Quick Start
+----------
+
+Converting an image to LaTeX:
+
+.. code-block:: python
+
+   from texteller import load_model, load_tokenizer, img2latex
+
+   # Load models
+   model = load_model(use_onnx=False)
+   tokenizer = load_tokenizer()
+
+   # Convert image to LaTeX
+   latex = img2latex(model, tokenizer, ["path/to/image.png"])[0]
+
+Processing a mixed text/formula image:
+
+.. code-block::python
+
+   from texteller import (
+       load_model, load_tokenizer, load_latexdet_model,
+       load_textdet_model, load_textrec_model, paragraph2md
+   )
+
+   # Load all required models
+   latex_model = load_model()
+   tokenizer = load_tokenizer()
+   latex_detector = load_latexdet_model()
+   text_detector = load_textdet_model()
+   text_recognizer = load_textrec_model()
+
+   # Convert to markdown
+   markdown = paragraph2md(
+       "path/to/mixed_image.png",
+       latex_detector,
+       text_detector,
+       text_recognizer,
+       latex_model,
+       tokenizer
+   )
+
+API Documentation
+----------------
+
+For detailed API documentation, please see :doc:`./api`.
+
+.. toctree::
+   :maxdepth: 2
+   :hidden:
+
+   api