Add zenodo release documentation (#569)

* Add zenodo release documentation

* Update with Community info

* Update structure/wording

* Reformat community link

doc/index.rst

@@ -10,4 +10,5 @@ ZTF Variable Source Classification Project
    scanner
    field_guide
    allocation
+   zenodo
    license

doc/zenodo.md

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+# Data Releases on Zenodo
+
+As more ZTF fields receive SCoPe classifications, we make them public on Zenodo. This page describes the data products available and provides a guide to preparing/publishing new data releases. The permanent link for the SCoPe III repository on Zenodo is [https://zenodo.org/doi/10.5281/zenodo.8410825](https://zenodo.org/doi/10.5281/zenodo.8410825). This link will always resolve to the latest data release.
+
+## Data product description
+
+The most recent data release contains these components:
+
+| file | description |
+| -------------- | ------------ |
+| field_296_100rows.csv | Demo predictions file containing 100 classified light curves |
+| fields.json | List of fields in classification catalog, generated when running `combine-preds` |
+| predictions_dnn_xgb_*N*_fields.zip | Zip file containing classification catalog (contains *N* combined DNN/XGB prediction files in CSV format) |
+| SCoPe_classification_demo.ipynb | Notebook interacting with demo predictions |
+| trained_dnn_models.zip | Zip file containing trained DNN models |
+| trained_xgb_models.zip | Zip file containing trained XGB models |
+| training_set.parquet | Parquet file containing training set |
+
+## Preparing a new release
+
+To begin a new release draft, click "New version" on the current release. The main difference between releases is the classification catalog Zip file, which adds more ZTF fields over time, along with `fields.json`. Other unchanged elements of the release may be imported from the previous release by clicking "Import files".
+
+## Publishing a new release
+
+To publish a new release after uploading the latest classification catalog, first ensure that all desired files are in place. Then, click "Get a DOI now!" to reserve a version-specific DOI for this release. Additionally, specify the publication date and version in `vX.Y.Z` format.
+
+Finally, create release notes by clicking "Add description" and choosing "Notes" under the "Type" dropdown. These release notes should specify what has changed from one version to the next.
+
+## Adding new users
+
+The "ZTF Source Classification Project" community [ztf-scope](https://zenodo.org/communities/ztf-scope) contains the current data repository. Inviting additional Zenodo users to this community as Curators will allow them to manage the repository and create new versions.