move apps to own dir

apps/activity/admin.py

@@ -0,0 +1,33 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2018-2019 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.contrib import admin
+
+from .models import Activity, ActivityType, Guest
+
+
+class ActivityAdmin(admin.ModelAdmin):
+    """
+    Admin customisation for Activity
+    """
+    list_display = ('name', 'activity_type', 'organizer')
+    list_filter = ('activity_type',)
+    search_fields = ['name', 'organizer__name']
+
+    # Organize activities by start date
+    date_hierarchy = 'date_start'
+    ordering = ['-date_start']
+
+
+class ActivityTypeAdmin(admin.ModelAdmin):
+    """
+    Admin customisation for ActivityType
+    """
+    list_display = ('name', 'can_invite', 'guest_entry_fee')
+
+
+# Register your models here.
+admin.site.register(Activity, ActivityAdmin)
+admin.site.register(ActivityType, ActivityTypeAdmin)
+admin.site.register(Guest)