Add sphinx docs (#16)

docs/source/getting-started.rst

@@ -0,0 +1,24 @@
+Getting Started
+===============
+
+Installation
+------------
+
+Directly install via ``pip`` by using:
+
+.. code-block:: bash
+
+    pip install sphinx-llms-txt
+
+Usage
+-----
+
+Add the extension to your Sphinx configuration (``conf.py``):
+
+.. code-block:: python
+
+    extensions = [
+        'sphinx_llms_txt',
+    ]
+
+Once added, the extension will automatically generate the LLMs.txt files during the build process.