Add training workflow, datasets, and runbook

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+Calendar Spreads
+Definition : A calendar spread, sometimes called a time spread or a
+horizontal spread , is an option strategy that involves buying one option and
+selling another option with the same strike price but with a different
+expiration date.
+At-expiration diagrams do a calendar-spread trader little good. Why? At
+the expiration of the short-dated option, the trader is left with another option
+that may have time value. To estimate what the position will be worth when
+the short-term option expires, the value of the long-term option must be
+analyzed using the greeks. This is true of the variants of the calendar—
+double calendars, diagonals, and double diagonals—as well. This chapter
+will show how to analyze strategies that involve options with different
+expirations and discuss how and when to use them.