Add training workflow, datasets, and runbook

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+Chapter 10
+Accepting exposure
+Brokerages and exchanges treat the acceptance of exposure by counter -
+parties in a very different way from counterparties who want to gain expo-
+sure. There is a good reason for this: although an investor gaining exposure 
+has an option to transact in the future, his or her counterparty—an investor 
+accepting exposure—has a commitment to transact in the future at the sole 
+discretion of the option buyer. If the investor accepting exposure does not 
+have the financial wherewithal to carry out the committed transaction, the 
+broker or exchange is on the hook for the liability.
+1
+For example, an investor selling a put option struck at $50 per share 
+is committing to buy the stock in question for $50 a share at some point 
+in the future—this is the essence of accepting exposure. If, however, 
+the investor does not have enough money to buy the stock at $50 at 
+some point in the future, the investor’s commitment to buy the shares is 
+economically worthless.
+To guard against this eventuality, brokers require exposure-accepting 
+investors to post a security deposit called margin that will fully cover the fi-
+nancial obligation to which the investor is committing. In the preceding ex-
+ample, for instance, the investor would have to keep $5,000 (= $50 per share × 
+100 shares/contract) in reserve and would not be able to spend those reserved 
+funds for stock or option purchases until the contract has expired worthless.
+Because of this margin requirement, it turns out that one of our strat-
+egies for accepting leverage—short puts—always carries with it a loss lev-
+erage of –1.0—exactly the same as the loss leverage of a stock. Think about 
+it this way: what difference is there between using $50 to buy a stock and