Added Artist,Album, and Song models for the about app

ronrodillas_music/about/models.py

 from django.db import models
 
 # Create your models here.
+class Artist(models.Model):
+    artist_name = models.CharField(max_length=100)
+    monthly_listeners = models.IntegerField()
+
+class Album(models.Model):
+    album_name = models.CharField(max_length=100)
+    artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
+    description = models.TextField()
+    release_date = models.DateField()
+
+class Song(models.Model):
+    song_title = models.CharField(max_length=100)
+    artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
+    album = models.ForeignKey(Album, on_delete=models.CASCADE)
+    song_length = models.IntegerField()
+    
\ No newline at end of file