Sokoban: Adding world1-015 and world1-016

PR: https://github.com/DoctorLai/sokoban-web/pull/11

world1-015 Two Sum v4

https://doctorlai.github.io/sokoban-web/?level=world1-015

world1-016 Three Sum v6

https://doctorlai.github.io/sokoban-web/?level=world1-016

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