adds vote posting

also moves some validation code to the model

playlist/models/vote.py

@@ -1,10 +1,11 @@
 from django.db import models
 from django.contrib.auth.models import User
+from django.core.validators import MinValueValidator, MaxValueValidator
 
 class Vote(models.Model):
     class Meta:
         unique_together = ["user", "track"]
     track = models.ForeignKey('Track', on_delete=models.CASCADE)
     user = models.ForeignKey(User, on_delete=models.CASCADE)
-    points = models.IntegerField()
+    points = models.IntegerField(validators=[MinValueValidator(1), MaxValueValidator(5)])
     skipped = models.BooleanField(default=False)