add ChartsSettingsService and interface to make it easier to use Charts without Views

charts.services.yml

@@ -7,3 +7,7 @@ services:
 
   charts.views_variable:
     class: Drupal\charts\Services\ViewsDataService
+
+  charts.settings:
+    class: Drupal\charts\Services\ChartsSettingsService
+    arguments: ['@config.factory']
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src/Services/ChartsSettingsService.php

+<?php
+
+namespace Drupal\charts\Services;
+
+use Drupal\Core\Config\ConfigFactory;
+
+class ChartsSettingsService implements ChartsSettingsServiceInterface{
+
+  //private $editableConfigName = 'charts.settings';
+  private $configFactory;
+
+  public function __construct(ConfigFactory $config_factory){
+    $this->configFactory = $config_factory;
+  }
+
+  public function getChartsSettings(){
+    $config = $this->configFactory->getEditable('charts.settings');
+
+    return $config->get('charts_default_settings');
+  }
+}
\ No newline at end of file

src/Services/ChartsSettingsServiceInterface.php

+<?php
+
+
+namespace Drupal\charts\Services;
+
+
+interface ChartsSettingsServiceInterface {
+
+  public function getChartsSettings();
+}
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