Add enum for colors

pauper_metagame_analysis/mtggoldfish.py

@@ -16,3 +16,10 @@ class Format(Enum):
     PENNY_DREADFUL = "penny_dreadful"
     COMMANDER_1V1  = "commander_1v1"
     COMMANDER      = "commander"
+
+class Color(Enum):
+    WHITE = 0
+    BLUE  = 1
+    BLACK = 2
+    RED   = 3
+    GREEN = 4