Describe S&co events dataset and use cases

examples/use-cases/shakespeare-and-company-project/README.md

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+# Data from the Shakespeare and Company Project
+
+The [Shakespeare and Company Project](https://shakespeareandco.princeton.edu/) publishes an events dataset that document lending library activities such as subscribing, renewing, and borrowing and returning books. Some of the dates for those events are only partially known.
+
+Dates are in ISO8601 format in one of the following formats: YYYY, YYYY-MM, YYYY-MM-DD, --MM-DD.
+
+Event dates are used for sorting, for filtering to determine if a member was active in a particular year, and for determining durations - how long a subscription lasted for, or how long a borrowed book was out. One special case is borrow events with unknown years: the Project assumes that the return was the same or successive year, so even though the years are unknown the duration can be calculated.
+
+The dataset includes durations for subscriptions and borrow events in human readable format and number of days.
+
+----
+
+This dataset is included here as a convenient example. If you want use it elsewhere, please
+reference the record with additional information and cite it properly.
+
+https://doi.org/10.34770/nz90-ym25
+
+