Installing outlet in electrical box with two sets of wires? - Home Improvement Stack Exchange

(apologies for possibly very newbie question) I found this setup in an electrical box in my downstairs closet underneath my stairs. It has two sets of wires that seems to be connected serially. My

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AC WORKS 4-Prong 220-Volt Plug to 120-Volt 15/ 20Amp Household Female Adapter Cord (4-Prong Dryer Outlet to Household W/Breaker)

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