old_contents: from django.contrib import admin
  from .models import Employee, Role, Category
  
  
  class RoleAdmin(admin.ModelAdmin):
      list_display = ("name",)
  
  
  class CategoryAdmin(admin.ModelAdmin):
      list_display = ("name", "weight",)
  
  
  class EmployeeAdmin(admin.ModelAdmin):
      list_display = ("username", "first_name", "last_name", "email",)
      fieldsets = (
          (None, {'fields': ('username', 'email', 'password')}),
          ('Personal info', {'fields': ('first_name',
                                        'last_name',
                                        'role',
                                        'skype_id',
                                        'avatar',
                                        'categories')}),
          ('Personal score', {'fields': ('last_month_score',
                                         'current_month_score',
                                         'level',
                                         'total_score')}),
          ('Permissions', {'fields': ('groups',
                                      'user_permissions',
                                      'is_superuser',
                                      'is_staff',
                                      'is_active',)}),
          ('History', {'fields': ('date_joined', 'last_login')})
      )
  
  admin.site.register(Employee, EmployeeAdmin)
  admin.site.register(Category, CategoryAdmin)
  admin.site.register(Role, RoleAdmin)
  
new_contents: from django.contrib import admin
  from .models import Employee, Role, Category
  
  
  class RoleAdmin(admin.ModelAdmin):
      list_display = ("name",)
  
  
  class CategoryAdmin(admin.ModelAdmin):
      list_display = ("name", "weight",)
  
  
  class EmployeeAdmin(admin.ModelAdmin):
      list_display = ("username", "first_name", "last_name", "email", 'level', 'total_score',)
      fieldsets = (
          (None, {'fields': ('username', 'email', 'password')}),
          ('Personal info', {'fields': ('first_name',
                                        'last_name',
                                        'role',
                                        'skype_id',
                                        'avatar',
                                        'categories')}),
          ('Personal score', {'fields': ('last_month_score',
                                         'current_month_score',
                                         'level',
                                         'total_score')}),
          ('Permissions', {'fields': ('groups',
                                      'user_permissions',
                                      'is_superuser',
                                      'is_staff',
                                      'is_active',)}),
          ('History', {'fields': ('date_joined', 'last_login')})
      )
  
  admin.site.register(Employee, EmployeeAdmin)
  admin.site.register(Category, CategoryAdmin)
  admin.site.register(Role, RoleAdmin)
  
subject: Add level and total_score on user list on admin site