docs: add assertVisible and assertMissing details to the README file

README.md

@@ -66,6 +66,8 @@ Pause the test for the specified number of milliseconds.
 - [assertAttribute](#assertattribute)
 - [assertDontSee](#assertdontsee)
 - [assertDontSee](#assertdontsee)
+- [assertVisible](#assertvisible)
+- [assertMissing](#assertmissing)
 
 #### assertAttribute
 
@@ -92,3 +94,29 @@ test('assert does not see', function () {
         ->assertDontSee('we are a streaming service');
 });
 ```
+
+#### assertVisible
+
+Assert that an element with the given selector is visible:
+
+```php
+test('assert visible', function () {
+    $url = 'https://laravel.com';
+
+    $this->visit($url)
+        ->assertVisible('h1:visible');
+});
+```
+
+#### assertMissing
+
+Assert that an element with the given selector is hidden:
+
+```php
+test('assert missing', function () {
+    $url = 'https://laravel.com';
+
+    $this->visit($url)
+        ->assertMissing('a.hidden');
+});
+```