docs : Add sphinx for handling documentation

Edit gitignore by ignoring the docs/build directory
Add sphinx dependencies to pyproject
Add docs folder

docs/source/conf.py

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+# Configuration file for the Sphinx documentation builder.
+#
+# For the full list of built-in configuration values, see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# -- Project information -----------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
+
+project = 'unisync'
+copyright = '2026, Paul Retourné'
+author = 'Paul Retourné'
+release = '0.1.0'
+
+# -- General configuration ---------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
+
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.viewcode',
+    'sphinx.ext.napoleon',
+    'sphinx.ext.todo'
+        ]
+
+templates_path = ['_templates']
+exclude_patterns = []
+
+
+
+# -- Options for HTML output -------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
+
+#html_theme = 'alabaster'
+html_theme = 'sphinx_rtd_theme'
+html_static_path = ['_static']
+
+autodoc_docstring_signature = True

docs/source/index.rst

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+.. unisync documentation master file, created by
+   sphinx-quickstart on Sun Jan  4 15:02:58 2026.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Documentation for unisync
+=========================
+
+Unisync is a data synchronising tool built around `unison`_ 
+
+.. _unison: https://github.com/bcpierce00/unison
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+       
+   modules
+

docs/source/modules.rst

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+unisync
+=======
+
+.. toctree::
+   :maxdepth: 4
+
+   unisync

docs/source/unisync.rst

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+unisync package
+===============
+
+Submodules
+----------
+
+unisync.argparser module
+------------------------
+
+.. automodule:: unisync.argparser
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+unisync.config module
+---------------------
+
+.. automodule:: unisync.config
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+unisync.defaults module
+-----------------------
+
+.. automodule:: unisync.defaults
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+unisync.errors module
+---------------------
+
+.. automodule:: unisync.errors
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+unisync.main module
+-------------------
+
+.. automodule:: unisync.main
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+unisync.paths module
+--------------------
+
+.. automodule:: unisync.paths
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+unisync.runners module
+----------------------
+
+.. automodule:: unisync.runners
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+unisync.synchroniser module
+---------------------------
+
+.. automodule:: unisync.synchroniser
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+Module contents
+---------------
+
+.. automodule:: unisync
+   :members:
+   :show-inheritance:
+   :undoc-members: