Add editor packages

internal/editor/event/message.go

@@ -0,0 +1,23 @@
+package event
+
+import "time"
+
+type Message struct {
+	t    time.Time
+	text string
+}
+
+func (e *Message) Time() time.Time {
+	return e.t
+}
+
+func (e *Message) Text() string {
+	return e.text
+}
+
+func NewMessage(s string) *Message {
+	return &Message{
+		t:    time.Now(),
+		text: s,
+	}
+}