add task admin file

services/backend/apps/task/admin.py

@@ -0,0 +1,13 @@
+from django.contrib import admin
+
+from apps.task.models import CompetitionTask
+
+
+@admin.register(CompetitionTask)
+class CompetitionTaskAdmin(admin.ModelAdmin):
+    list_display = ("title", "type", "points")
+
+
+class CompetitionTaskInline(admin.StackedInline):
+    model = CompetitionTask
+    extra = 0