Add customer management

internal_frontend/services/customers/dtos/createCustomer.dto.ts

@@ -0,0 +1,19 @@
+export interface PhoneNumberDto {
+    number: string;
+    note: string;
+}
+
+export interface NoteDto {
+    text: string;
+}
+
+export interface CreateCustomerDto {
+    email: string;
+    name: string;
+    companyName: string;
+    phoneNumbers: PhoneNumberDto[];
+    street: string;
+    zip: string;
+    city: string;
+    notes: NoteDto[];
+}