Added total time of a course, marking chapters and courses to sync offline.

routes/web.php

@@ -16,6 +16,7 @@ use Illuminate\Support\Facades\Route;
 Route::get('/download', [\App\Http\Controllers\Index::class, 'download']);
 Route::get('/', [\App\Http\Controllers\Index::class, 'index']);
 Route::get('/course/{course}', [\App\Http\Controllers\CourseController::class, 'index'])->name('course.index');
+Route::get('/course/{course}/sync', [\App\Http\Controllers\CourseController::class, 'sync'])->name('course.sync');
 Route::get('/chapter/{chapter}', [\App\Http\Controllers\CourseController::class, 'chapter'])->name('course.chapter');