Add Opossum Cow

cows/opossum.json

@@ -0,0 +1,6 @@
+{
+    "name": "Cowpossum",
+    "breed": "Cowsupial",
+    "image": "images/cowpossum.png",
+    "description": "The Virginia Opossum was long believed to be North America's only native marsupial, until shocked cow scientists discovered the existence of the Cowpossum. To not damage the pride of the Virgina Opossum, a new subspecies of Cowsupial was created so the Virgina Opossum can remain North America's Only Native Marsupial."
+}