refactor(common): Teacher

common/src/interfaces/teacher-invitation.d.ts

@@ -0,0 +1,8 @@
+import { UserDTO } from './user';
+import { ClassDTO } from './class';
+
+export interface TeacherInvitationDTO {
+    sender: string | UserDTO;
+    receiver: string | UserDTO;
+    class: string | ClassDTO;
+}

common/src/interfaces/teacher.d.ts

@@ -0,0 +1,12 @@
+export interface TeacherDTO {
+    id: string;
+    username: string;
+    firstName: string;
+    lastName: string;
+    endpoints?: {
+        classes: string;
+        questions: string;
+        invitations: string;
+        groups: string;
+    };
+}