for making package refer link
http://laraveldaily.com/how-to-create-a-laravel-5-package-in-10-easy-steps/, (*1)
In main composer.json put, (*2)
"require":
{
"laraveltest/testpkg": "*@dev"
}, (*3)
"psr-4":
{
"App\": "app/",
"Laraveltest\Testpkg\": "vendor/laraveltest/testpkg/src"
}, (*4)
add this "Laraveltest\Testpkg\TimezonesServiceProvider::class" in app/config.php, (*5)
make a blank folder with name "database" in laraveltest/testpkg/database, (*6)
run command "composer update" on terminal, (*7)