feat(database): count query (#78)

Author: erikaraujo

src/Web/Documentation/content/main/1-essentials/05-models.md

@@ -158,6 +158,20 @@ $data = query('chapters')
     ->all();
 ```
 
+```php
+$data = query('chapters')
+    ->count()
+    ->where('title = ?', 'Timeline Taxi')
+    ->andWhere('index <> ?', '1')
+    ->execute();
+```
+
+```php
+$data = query('chapters')
+    ->count('title')
+    ->execute();
+```
+
 ```php
 query('chapters')
     ->update(