Move software files one directory up, Readme

src/data/models/exercises/exerciseModel.ts

@@ -0,0 +1,12 @@
+import { ExerciseGroupModel } from "./exerciseGroupModel"
+
+export class ExerciseModel {
+  id = -1
+  nameDe: string = ""
+  nameEn: string = ""
+  exerciseNr: number = 0
+  descriptionDe: string = ""
+  descriptionEn: string = ""
+  solved: boolean = false
+  exerciseGroup: ExerciseGroupModel
+}