Add training workflow, datasets, and runbook

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+Selling the Front, Buying the Back
+If for a particular stock, the February ATM calls are trading at 50 volatility
+and the May ATM calls are trading at 35 volatility, a vol-calendar trader
+would buy the Mays and sell the Februarys. Sounds simple, right? The devil
+is in the details. We’ll look at an example and then discuss some common
+pitfalls with vol-trading calendars.
+George has been studying the implied volatility of a $164.15 stock.
+George notices that front-month volatility has been higher than that of the
+other months for a couple of weeks. There is nothing in the news to indicate
+immediate risk of extraordinary movement occurring in this example.
+George sees that he can sell the 22-day July 165 calls at a 45 percent IV
+and buy the 85-day September 165 calls at a 38 percent IV. George would
+like to buy the calendar spread, because he believes the July ATM volatility
+will drop down to around 38, where the September is trading. If he puts on
+this trade, he will establish the following position:
+What are George’s risks? Because he would be selling the short-term
+ATM option, negative gamma could be a problem. The greeks for this trade,
+shown in Exhibit 11.7 , confirm this. The negative gamma means each
+dollar of stock price movement causes an adverse change of about 0.09 to
+delta. The spread’s delta becomes shorter when the stock rises and longer
+when the stock falls. Because the position’s delta is long 0.369 from the
+start, some price appreciation may be welcomed in the short term. The stock
+advance will yield profits but at a diminishing rate, as negative gamma
+reduces the delta.