.setup.sh installation script

Add working .setup.sh installation script:

• Install Bedrock
• Install wpackagist-plugin/timber-library Wordpress plugin
• Install wpackagist-plugin/acf-extended Wordpress plugin
• Install wpackagist-plugin/wp-migrate-db Wordpress plugin
• Install wpackagist-plugin/wordpress-seo Wordpress plugin
• Install wpackagist-plugin/duplicate-page Wordpress plugin
• Install wpackagist-plugin/contact-form-7 Wordpress plugin
• Install wpackagist-plugin/wp-mail-smtp Wordpress plugin
• Install wpackagist-plugin/contact-form-7-dynamic-text-extension Wordpress plugin
  -Self-destroy all boilerplate files