Preliminary first draft of backend requests for quiz creation and editing

FullstackProsjekt/src/frontend/src/JSONparser.js

.../src/frontend/src/components/shared/EditQuestionModel.vue

...t/src/frontend/src/components/shared/NewQuestionModel.vue

...sjekt/src/frontend/src/components/shared/QuestionCard.vue

...kProsjekt/src/frontend/src/components/shared/QuizCard.vue

FullstackProsjekt/src/frontend/src/data/categories.js

FullstackProsjekt/src/frontend/src/data/difficulties.js

FullstackProsjekt/src/frontend/src/models/question.js

FullstackProsjekt/src/frontend/src/models/quiz.js

FullstackProsjekt/src/frontend/src/router/index.js

FullstackProsjekt/src/frontend/src/tokenController.js

FullstackProsjekt/src/frontend/src/views/EditQuizView.vue

FullstackProsjekt/src/frontend/src/views/NewQuizView.vue

...stackProsjekt/src/frontend/src/views/OverviewQuizView.vue