Add coding symbol rail

src/main.zig

@@ -6,6 +6,7 @@ const protocol = @import("protocol.zig");
 const replay = @import("replay.zig");
 const session = @import("session.zig");
 const socket = @import("socket.zig");
+const symbol = @import("symbol.zig");
 const tui = @import("tui.zig");
 
 pub const version = "0.1.0-dev";
@@ -126,6 +127,7 @@ test {
     _ = replay;
     _ = session;
     _ = socket;
+    _ = symbol;
     _ = tui;
 }