added themes and readme.txt in modules

dist/drupal/modules/README.txt

+Modules extend your site functionality beyond Drupal core.
+
+WHAT TO PLACE IN THIS DIRECTORY?
+--------------------------------
+
+Placing downloaded and custom modules in this directory separates downloaded and
+custom modules from Drupal core's modules. This allows Drupal core to be updated
+without overwriting these files.
+
+DOWNLOAD ADDITIONAL MODULES
+---------------------------
+
+Contributed modules from the Drupal community may be downloaded at
+https://www.drupal.org/project/project_module.
+
+ORGANIZING MODULES IN THIS DIRECTORY
+------------------------------------
+
+You may create subdirectories in this directory, to organize your added modules,
+without breaking the site. Some common subdirectories include "contrib" for
+contributed modules, and "custom" for custom modules. Note that if you move a
+module to a subdirectory after it has been enabled, you may need to clear the
+Drupal cache so it can be found.
+
+There are number of directories that are ignored when looking for modules. These
+are 'src', 'lib', 'vendor', 'assets', 'css', 'files', 'images', 'js', 'misc',
+'templates', 'includes', 'fixtures' and 'Drupal'.
+
+MULTISITE CONFIGURATION
+-----------------------
+
+In multisite configurations, modules found in this directory are available to
+all sites. You may also put modules in the sites/all/modules directory, and the
+versions in sites/all/modules will take precedence over versions of the same
+module that are here. Alternatively, the sites/your_site_name/modules directory
+pattern may be used to restrict modules to a specific site instance.
+
+MORE INFORMATION
+----------------
+
+Refer to the “Developing for Drupal” section of the README.txt in the Drupal
+root directory for further information on extending Drupal with custom modules.

dist/drupal/themes/README.txt

+Themes allow you to change the look and feel of your Drupal site. You can use
+themes contributed by others or create your own.
+
+WHAT TO PLACE IN THIS DIRECTORY?
+--------------------------------
+
+Placing downloaded and custom themes in this directory separates downloaded and
+custom themes from Drupal core's themes. This allows Drupal core to be updated
+without overwriting these files.
+
+DOWNLOAD ADDITIONAL THEMES
+--------------------------
+
+Contributed themes from the Drupal community may be downloaded at
+https://www.drupal.org/project/project_theme.
+
+MULTISITE CONFIGURATION
+-----------------------
+
+In multisite configurations, themes found in this directory are available to
+all sites. You may also put themes in the sites/all/themes directory, and the
+versions in sites/all/themes will take precedence over versions of the same
+themes that are here. Alternatively, the sites/your_site_name/themes directory
+pattern may be used to restrict themes to a specific site instance.
+
+MORE INFORMATION
+-----------------
+
+Refer to the "Appearance" section of the README.txt in the Drupal root directory
+for further information on customizing the appearance of Drupal with custom
+themes.