Add ExerciceEnonce model

models/ExerciceEnonce.ts

+import EnonceFile from '../../shared/types/Dojo/EnonceFile';
+import Enonce     from './Enonce';
+import GitlabFile from '../../shared/types/Gitlab/GitlabFile';
+
+
+interface ExerciceEnonce {
+    enonce: Enonce;
+    enonceFile: EnonceFile;
+    immutable: Array<GitlabFile>;
+}
+
+
+export default ExerciceEnonce;
\ No newline at end of file