Adds custom question class to represent each question

Author: Eclipse-Dominator

frontend/src/models/Quesiton.model.tsx

@@ -0,0 +1,30 @@
+export class Question {
+  title: string;
+  descMd: string;
+  displayedQuestion: string;
+  categories: string[];
+  difficulty: number;
+  id: number;
+
+  constructor(
+    id: number,
+    title: string,
+    descMd: string,
+    categories: string[],
+    difficulty: number
+  ) {
+    this.title = title;
+    this.descMd = descMd;
+    this.categories = categories;
+    this.difficulty = difficulty;
+    this.id = id;
+    this.displayedQuestion = `${id}.  ${title}`;
+  }
+}
+
+export type QnFilter = {
+  qnFilter?: string;
+  tagFilter?: Set<string>;
+  difficultyFilter?: [number, number];
+  titleAscd?: boolean;
+};