feat: send "End"-Message only once

- send "End" once, then fallback to "Idle"
- update README

internal/pomodoro/pomodoro.go

@@ -3,6 +3,7 @@ package pomodoro
 import (
 	"git.smsvc.net/pomodoro/GoTomato/internal/shared"
 	"sync"
+	"time"
 )
 
 var pomodoroResetChannel = make(chan bool, 1)
@@ -40,10 +41,16 @@ func RunPomodoro() {
 		shared.Message.Mode = "End"
 	}
 
+	time.Sleep(time.Second)
+
 	mu.Lock()
 	shared.Message.Ongoing = false
 	shared.Message.Paused = false
 	mu.Unlock()
+
+	shared.Message.Mode = "Idle"
+	shared.Message.Session = 0
+	shared.Message.TimeLeft = shared.Message.PomodoroSettings.Work
 }
 
 // Stops and resets the running Pomodoro