Generate configuration yaml file through the install generator

Author: michael-misshore

lib/config/critical_path_css.yml

@@ -0,0 +1,15 @@
+defaults: &defaults
+  routes:
+    - /
+
+development:
+  <<: *defaults
+  base_url: http://localhost:3000
+
+staging:
+  <<: *defaults
+  base_url: http://staging.example.com
+
+production:
+  <<: *defaults
+  base_url: http://example.com

lib/generators/critical_path_css/install_generator.rb

@@ -9,5 +9,11 @@ def copy_rake_task
       task_filename = 'critical_path_css.rake'
       copy_file "../../tasks/#{task_filename}", "lib/tasks/#{task_filename}"
     end
+
+    # Copy the needed configuration YAML file for generating critical CSS
+    def copy_config_file
+      task_filename = 'critical_path_css.yml'
+      copy_file "../../config/#{task_filename}", "config/#{task_filename}"
+    end
   end
 end