Add credit card fee info

public/parts/signup.php

@@ -203,6 +203,11 @@ if (isset($_SESSION['familyid']) && $database->has('families', ['familyid' => $_
                             <div class="card-text text-success mb-1">
                                 <i class="fas fa-lock"></i> We can't see your card info; it's sent directly and securely from your computer to our payment processor.
                             </div>
+                            <?php if ($SETTINGS["prices"]["add_stripe_fees"]) { ?>
+                            <div class="card-text text-info mb-1">
+                                <i class="fas fa-info-circle"></i> Credit card fees are automatically calculated and added to your total.
+                            </div>
+                            <?php } ?>
                         </div>
                         <div class="col-12 col-md-4">
                             <div class="form-group">