Added mail to inform users about still running time entries

app/Mail/TimeEntryStillRunningMail.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mail;
+
+use App\Models\TimeEntry;
+use App\Models\User;
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Facades\URL;
+
+class TimeEntryStillRunningMail extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    public TimeEntry $timeEntry;
+
+    public User $user;
+
+    /**
+     * Create a new message instance.
+     *
+     * @return void
+     */
+    public function __construct(TimeEntry $timeEntry, User $user)
+    {
+        $this->timeEntry = $timeEntry;
+        $this->user = $user;
+    }
+
+    /**
+     * Build the message.
+     */
+    public function build(): self
+    {
+        return $this->markdown('emails.time-entry-still-running', [
+            'dashboardUrl' => URL::route('dashboard'),
+        ])
+            ->subject(__('Your Time Tracker is still running!'));
+    }
+}