create basic Message model

models/Message.py

@@ -0,0 +1,21 @@
+from ..app import db, ma
+import enum
+
+class Players(enum.Enum):
+    BLACK = "The player taking black stones"
+    WHITE = "The player taking white stones"
+
+class Branch(db.Model):
+        __table_args__ = {'extend_existing': True}
+
+    id = db.Column(db.Integer, primary_key=True)
+    player = db.Column(db.Enum(Players))
+    x_point = db.Column(db.Integer)
+    y_point = db.Column(db.Integer)
+    move_number = db.Column(db.Integer)
+
+    # foreign keys
+    game = db.Column(db.Integer, db.ForeignKey("game.id"))
+
+    def __init__(self):
+        pass