Update outdated info in STARTERKIT README file

Mistakes are things that were wrong when they were made. The README file was correct when it was written, but is now outdated. :-)

Thanks for the patch!

Hi there,

Can you confirm that the STARTERKIT README file is complete for Drupal 8 alpha 14 ?

I have tried to manually create a sub-theme following the given steps and I get the following errors :

Unable to install ... block.block.STARTERKIT_account_menu, block.block.STARTERKIT_branding, block.block.STARTERKIT_breadcrumbs, block.block.STARTERKIT_content, block.block.STARTERKIT_footer, block.block.STARTERKIT_help, block.block.STARTERKIT_local_actions, block.block.STARTERKIT_local_tasks, block.block.STARTERKIT_main_menu, block.block.STARTERKIT_messages, block.block.STARTERKIT_page_title, block.block.STARTERKIT_powered, block.block.STARTERKIT_search, block.block.STARTERKIT_secondary_navigation, block.block.STARTERKIT_tools have unmet dependencies.

It looks like there are many more places where STARTERKIT needs to be replaced by the machine name of our custom sub-theme.

I would think about the STARTERKIT.libraries.yml file that is not mentionned (and it's content)
Also the many occurences of STARTERKIT inside the .info.yml file
All the files inside the config >> install folder (their name + what's inside)
The twig namespace at the beginning of all template files...

It seems the module Component Libraries is also required so that the sub-theme works. So that should be part of the Readme file as well...

[Update] See:

Create a Zen 8.x-7.x sub-theme - Manually
https://www.drupal.org/node/2767991

[Update] See comment above

I have added Component Libraries module information in the Readme file. Added the patch.