Add admin pages for teams models (#22284)

lms/djangoapps/teams/admin.py

+"""
+Admin registration for Course Teams.
+"""
+from __future__ import absolute_import, unicode_literals
+
+from django.contrib import admin
+
+from .models import CourseTeam, CourseTeamMembership
+
+
+@admin.register(CourseTeam)
+class CourseTeamAdmin(admin.ModelAdmin):
+    """
+    Admin config for course teams.
+    """
+    list_display = ('course_id', 'topic_id', 'team_id', 'name', 'team_size')
+    search_fields = ('course_id', 'topic_id', 'team_id', 'name', 'description')
+    ordering = ('course_id', 'topic_id', 'team_id')
+    readonly_fields = ('team_size',)
+
+
+@admin.register(CourseTeamMembership)
+class CourseTeamMembershipAdmin(admin.ModelAdmin):
+    """
+    Admin config for course team memberships.
+    """
+    list_display = ('team', 'user', 'date_joined', 'last_activity_at')
+    search_fields = ('team__team_id', 'user__username', 'user__email')