Sync scores between players

board-network/src/protocol.rs

@@ -51,6 +51,8 @@ pub enum ServerMessage {
     PlayerTurn(usize),
     /// Update the current hand of the player
     SyncHand(Vec<TileRef>),
+    /// Update the score of the n-th player.
+    SyncScore(usize, u32),
     /// Informs that a tile has been placed
     TilePlaced(Position2dRef, TileRef),
     /// Informs that a tile has been removed