use ManyToManyField for storing liked videos in User model

backend/videoflix/users/admin.py

@@ -13,6 +13,7 @@ class CustomUserAdmin(UserAdmin):
       'Individual data',
       {
         'fields': (
+          'liked_videos',
           'verify_email_token',
           )
        }

backend/videoflix/users/models.py

@@ -2,9 +2,11 @@ import string
 import secrets
 from django.contrib.auth.models import AbstractUser
 from django.db import models
+from content.models import Video
 
 class CustomUser(AbstractUser):
     verify_email_token = models.CharField(max_length=20, blank=True, null=True)
+    liked_videos = models.ManyToManyField(Video, blank=True)
 
     def save(self, *args, **kwargs):
         if not self.verify_email_token: