Initial version of RELEASE.md

RELEASE.md

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+# Release workflow
+
+## PyPI
+
+#. Draft a new release on github with a new tag (create on publish) in the style `vMajor.Minor.Patch`, where `Major`, `Minor`, and `Patch` are integers according to semnatic versioning
+#. Use the autogenerated changelog to update `CHANGELOG.md` in main
+#. Copy the modified changelog from the file to the github release draft
+#. Release the new version on github
+#. Approve the release run in the actions tab
+#. Verify that the upload to PyPI succeeded
+
+
+## Conda-forge
+
+#. Do the PyPI release first
+#. Rebase the `conda-forge-release` branch on the latest release
+#. Create a tag with `vMajor.Minor.Patch-cf` at the head of that branch
+#. Update the conda-forge repository with the version and checksum