docs(cpp11): add STL real-world case, exercise mapping, and tagged-union exercise for 16-generalized-unions - #57

docs(cpp11): add STL real-world case, exercise mapping, and tagged-union exercise for 16-generalized-unions#57

Sunrisepeak merged 6 commits into

mcpp-community:mainmcpp-community/d2mcpp:mainfrom

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