Add internal doc

PiperOrigin-RevId: 707911189

.readthedocs.yaml

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+# Read the Docs configuration file for Sphinx projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+python:
+  install:
+    # `pip install .[docs]` fail: https://github.com/pypa/pip/issues/13092
+    # So try to install the dependencies separately.
+    - requirements: docs/requirements.txt
+    - method: pip
+      path: .

docs/conf.py

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+# Copyright 2024 DeepMind Technologies Limited.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Generate documentation.
+
+Usage (from the root directory):
+
+```sh
+pip install -e .[docs]
+
+sphinx-build -b html docs/ docs/_build
+```
+"""
+
+import apitree
+
+
+apitree.make_project(
+    # TODO(epot): Add api
+    modules={},
+    includes_paths={},
+    globals=globals(),
+)

docs/index.md

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+```{include} ../README.md
+```

docs/requirements.txt

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+sphinx-apitree[ext]