Add docs about overriding classes

Author: rawilk

docs/advanced-usage/overriding-classes.md

@@ -0,0 +1,78 @@
+---
+title: Overriding Classes
+sort: 3
+---
+
+## Overriding Classes
+
+When you override a component class with your own, you will need to update the class referenced for the component alias in the config.
+For the `select` component, it would look like this:
+
+**Custom Class:**
+```php
+<?php
+
+namespace App\View;
+
+use Rawilk\FormComponents\Components\Inputs\Select;
+
+class MySelect extends Select
+{
+    // Override stuff here...
+    
+    /*
+     * You will need to override this method to
+     * let the BladeComponent parent class
+     * know where to look for this component's
+     * view.
+     * 
+     * Alternatively, you can override the
+     * "render" method.
+     */
+    public static function getName(): string
+    {
+        return 'inputs.select';
+    }
+}
+```
+
+**Config:**
+```php
+<?php
+
+return [
+    'components' => [
+        // ...
+        'select' => \App\View\MySelect::class,
+    ],
+
+    // ...
+];
+```
+
+> {note} If you choose to override a class, you will need to override either the `getName` method (as shown in code above)
+> or override the `render` method, so the parent `BladeComponent` class will use the correct view.
+
+Some component classes will also need to be bound in the container in a service provider since internally this package does not
+reference components by alias. One of those components is the `label` component, which is referenced by the `form-group` component
+internally. To have the correct class be used, you can bind the overridden class in a service provider in the `register` method:
+
+```php
+<?php
+
+namespace App\Providers;
+
+use App\View\MyCustomLabelClass;
+use Illuminate\Support\ServiceProvider;
+use Rawilk\FormComponents\Components\Label;
+
+class AppServiceProvider extends ServiceProvider
+{
+    public function register()
+    {
+        $this->app->bind(Label::class, MyCustomLabelClass::class);
+    }
+}
+```
+
+Any component classes you override should follow the same pattern as illustrated above in a service provider.