add personalization settings

app/controllers/personalization_settings_controller.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class PersonalizationSettingsController < ApplicationController
+  def show; end
+
+  def create
+    account_config =
+      current_account.account_configs.find_or_initialize_by(key: encrypted_config_params[:key])
+
+    account_config.update!(encrypted_config_params)
+
+    redirect_back(fallback_location: settings_personalization_path, notice: 'Settings have been saved.')
+  end
+
+  private
+
+  def encrypted_config_params
+    params.require(:account_config).permit!
+  end
+end