Add readthedoc configuration

.readthedocs.yaml

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+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.11"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+    configuration: docs/source/conf.py
+
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+python:
+    install:
+    - requirements: docs/requirements.txt

docs/requirements.txt

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+sphinx
+sphinx_rtd_theme
+wget
+numba
+numpy
+scipy
+h5py
+tqdm
+openpmd_viewer