adding quickfix library

quickfix/internal/event.go

@@ -0,0 +1,15 @@
+package internal
+
+// Event is an abstraction for session events.
+type Event int
+
+const (
+	// PeerTimeout indicates the session peer has become unresponsive.
+	PeerTimeout Event = iota
+	// NeedHeartbeat indicates the session should send a heartbeat.
+	NeedHeartbeat
+	// LogonTimeout indicates the peer has not sent a logon request.
+	LogonTimeout
+	// LogoutTimeout indicates the peer has not sent a logout request.
+	LogoutTimeout
+)