If there really were some “how to” on creating an entertaining TV show, more people would use it.

Still, you could do worse than following the path blazed by Pete Nowalk, creator of the wild and wildly entertaining How To Get Away with Murder (ABC, Thursday, 10 ET/PT; *** out of four). And the first step is to hire a terrific actor to star — though good luck finding one as good as Viola Davis. Bringing every ounce of her considerable talent to bear in Wednesday’s opener, Davis convincingly m