add some generic files

.pre-commit-config.yaml

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+# https://pre-commit.com/
+repos:
+  # isort should run before black as black sometimes tweaks the isort output
+  - repo: https://github.com/timothycrosley/isort
+    rev: 4.3.21-2
+    hooks:
+      - id: isort
+        files: .+\.py$
+  # https://github.com/python/black#version-control-integration
+  - repo: https://github.com/python/black
+    rev: stable
+    hooks:
+      - id: black
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.7.9
+    hooks:
+      - id: flake8
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.761  # Must match ci/requirements/*.yml
+    hooks:
+      - id: mypy
+  # run this occasionally, ref discussion https://github.com/pydata/xarray/pull/3194
+  # - repo: https://github.com/asottile/pyupgrade
+  #   rev: v1.22.1
+  #   hooks:
+  #     - id: pyupgrade
+  #       args:
+  #         - "--py3-only"
+  #         # remove on f-strings in Py3.7
+  #         - "--keep-percent-format"

.readthedocs.yml

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+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+build:
+  image: stable
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: doc/conf.py
+
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally build your docs in additional formats such as PDF
+# formats:
+#   - pdf
+
+# Optionally set the version of Python and requirements required to build your docs
+conda:
+    environment: ci/doc.yml
+
+python:
+  install:
+    - method: pip
+      path: .

cf_xarray/__init__.py

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+from .accessor import CFDataArrayAccessor, CFDatasetAccessor