Add some question/answer#20

Ishikagarg-ig wants to merge 2 commits intofnplus:masterfnplus/hacktoberfest-flutter-interview-questions:masterfrom

Ishikagarg-ig:my-question-answerIshikagarg-ig/HACKTOBERFEST-2020-flutter-interview-questions:my-question-answerCopy head branch name to clipboard