Add training workflow, datasets, and runbook

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+Cl,apter 31: Index Spreading 587 
+Volatility Differential. A theoretical "edge" that sometimes appears is that of 
+volatility differential. If two indices are supposed to have essentially the same volatil­
+ity, or at least a relationship in their volatilities, then one might be able to establish 
+an option spread if that relationship gets out ofline. In such a case, the options might 
+actually show up as fair-valued on both indices, so that the disparity is in the volatili­
+ty differential, and not in the pricing of the options. 
+OEX and SPX options trade with essentially the same implied volatility. 
+Thus, if one index's options are trading with a higher implied volatility than the 
+other's, a potential spread might exist. Normally, one would want the differential 
+in implied volatilities to be at least 2% apart before establishing the spread for 
+volatility reasons. 
+In any case, whether establishing the spread because one thinks the cash index 
+relationship is going to change, or because the options on one index are expensive 
+with respect to the options on the other index, or because of the disparity in volatili­
+ties, the spreader must use the deltas of the options and the price ratio and volatili­
+ties of the indices in setting up the spread. 
+Striking Price Differential. The index relationships can also be used by the 
+option trader in another way. When an option spread is being established with 
+options whose strikes are not near the current index prices - that is, they are rela­
+tively deeply in- or out-of-the-money- one can use the ratio between the indices to 
+determine which strikes are equivalent. 
+Example: ZYX is trading at 250 and the ZYX July 270 call is overpriced. An option 
+strategist might want to sell that call and hedge it with a call on another index. 
+Suppose he notices that calls on the UVX Index are trading at approximately fair 
+value with the UVX Index at 175. What UVX strike should he buy to be equivalent 
+to the ZYX 270 strike? 
+One can multiply the ZYX strike, 270, by the ratio of the indices to arrive at the 
+UVX strike to use: 
+UVX strike= 270 x (175/250) 
+= 189.00 
+So he would buy the UVX July 190 calls to hedge. The exact number of calls to 
+buy would be determined by the formula given previously for option ratio.