added file in the tutorials for JSON#16

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hassandaru wants to merge 9 commits intoseenickcode:masterfrom

hassandaru:patch-2

Commits on Aug 2, 2022

Update json_serializable from ^4.1.3 to ^6.3.1 in pubspec.yaml; Auto-updated pubspec.lock files included from *flutter pub get*
svoboda01
committed

Commits on Aug 3, 2022

Merge pull request #13 from svoboda01/master
seenickcode
authored

Commits on Aug 5, 2022