change livestock types weight

apps/livestock/models.py

@@ -18,6 +18,15 @@ class LiveStockSpecies(BaseModel):  # noqa
 class LiveStockType(BaseModel):  # noqa
     """ types like sheep, cow, camel, etc """
     name = models.CharField(max_length=50)
+    weight_types = (
+        ('L', 'Light'),
+        ('H', 'Heavy')
+    )
+    weight_type = models.CharField(
+        choices=weight_types,
+        max_length=50,
+        null=True
+    )
 
     def __str__(self):
         return f'{self.name}'