add /help command

internal/bot/handlers.go

@@ -85,6 +85,8 @@ func (h *Handler) HandleMessage(update tgbotapi.Update) {
 	switch msg.Text {
 	case "/start":
 		h.handleStart(msg)
+	case "/help":
+		h.handleHelp(msg)
 	case "/clockin":
 		h.handleActionMsg(msg, h.clockIn)
 	case "/clockout":
@@ -355,6 +357,25 @@ func (h *Handler) handleStart(msg *tgbotapi.Message) {
 	h.Bot.Send(menu)
 }
 
+func (h *Handler) handleHelp(msg *tgbotapi.Message) {
+	text := `Commands:
+/start - Show main menu
+/clockin - Clock in
+/clockout - Clock out
+/worktype - Select work type
+/dayoff - Toggle day off
+/report - Show today report
+/export - Export monthly report (Excel)
+/history - View calendar history
+/edit YYYY-MM-DD - Edit a specific day
+/reporttoggle - Enable/disable auto report
+/setreporttime HH:MM - Set daily report time
+/setaccent - Select accent color
+
+Buttons on the main menu also work.`
+	h.sendText(msg.Chat.ID, text)
+}
+
 func (h *Handler) handleWorkTypeMsg(msg *tgbotapi.Message) {
 	user, day, err := h.getUserToday(msg.Chat.ID)
 	if err != nil {