PYTHON-2817 Add .readthedocs.yaml config file (#769)

.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
+
+# Build documentation in the doc/ directory with Sphinx
+sphinx:
+   configuration: doc/conf.py
+
+# Set the version of Python and requirements required to build the docs.
+python:
+   version: 3.8
+   install:
+      # Install pymongo itself.
+      - method: pip
+        path: .
+      - requirements: doc/docs-requirements.txt

doc/docs-requirements.txt

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+Sphinx~=4.2
+sphinx_rtd_theme~=0.5
+readthedocs-sphinx-search~=0.1