Add Premium feature with UI, model changes, and admin configuration

users/admin.py

@@ -1,3 +1,24 @@
 from django.contrib import admin
+from .models import Profile
 
-# Register your models here.
+
+@admin.register(Profile)
+class ProfileAdmin(admin.ModelAdmin):
+    list_display = (
+        'user',
+        'first_name',
+        'last_name',
+        'is_premium',
+        'birth_date',
+    )
+    search_fields = (
+        'user__username',
+        'first_name',
+        'last_name',
+        'biography',
+    )
+    list_filter = (
+        'is_premium',
+        'birth_date',
+    )
+    autocomplete_fields = ('user',)