Add UsersModule

This contains the module, a service (which only returns mock data), a model and the UserInfo DTO.

Signed-off-by: David Mehren <git@herrmehren.de>

src/users/users.service.ts

@@ -0,0 +1,15 @@
+import { Injectable } from '@nestjs/common';
+import { UserInfoDto } from './user-info.dto';
+
+@Injectable()
+export class UsersService {
+  getUserInfo(): UserInfoDto {
+    //TODO: Use the database
+    return {
+      displayName: 'foo',
+      userName: 'fooUser',
+      email: 'foo@example.com',
+      photo: '',
+    };
+  }
+}