Sergei-Levshnia/homework: Nix-study-course homeworks @ de9275896d1b3f9182adb76f896c7d1ff3500816

miskson de9275896d merging cart implementation with master branch		3 lat temu
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GQL_files	de9275896d merging cart implementation with master branch	3 lat temu
GQL.html	de9275896d merging cart implementation with master branch	3 lat temu