ypdated the grpups page and upload

models.py

@@ -48,4 +48,15 @@ class User(db.Model, UserMixin):
     def get_id(self):
         return str(self.id)
 
+class Group(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(100), nullable=False, unique=True)
+    players = db.relationship('Player', secondary='group_player', backref='groups')
+
+# Association table for many-to-many relationship between Group and Player
+group_player = db.Table('group_player',
+    db.Column('group_id', db.Integer, db.ForeignKey('group.id'), primary_key=True),
+    db.Column('player_id', db.Integer, db.ForeignKey('player.id'), primary_key=True)
+)
+
 # other models...