Added documentation for empty data

Author: Fa-BRAIK

docs/EmptyData.md

@@ -0,0 +1,60 @@
+Empty Data
+=
+
+Sometimes we may need to create a fresh instance of a DTO without any data, 
+and by default `Data` classes have the ability to create an `"empty"` instance:
+
+```php
+use Nuxtifyts\PhpDto\Data;
+use DateTimeImmutable;
+
+final reaconly class Todo extends Data
+{
+    public function __construct(
+        public string $title,
+        public string $content,
+        public Status $status,
+        public ?DateTimeImmutable $dueDate
+    ) {}
+}
+```
+
+The `Status` enum is defined as follows:
+
+```php
+enum Status: string
+{
+    case DEFAULT = 'default';
+    case DONE = 'done';
+    case CANCELED = 'canceled';
+}
+```
+
+By calling the `empty()` method, we can create a new instance of the `Todo` class with all properties set to `null`:
+
+```php
+$emptyTodo = Todo::empty();
+```
+
+The `$emptyTodo` variable will contain the following data:
+
+```
+[
+  'title' => '',
+  'comtent' => '',
+  'status' => Status::DEFAULT,
+  'dueDate' => null
+]
+```
+
+This is useful when we want to gradually fill in the data of a DTO instance, 
+here is a list of the empty values for each type: 
+
+- `NULL`: `null` (Null takes priority over everything)
+- `STRING`: `''`
+- `INT`: `0`
+- `FLOAT`: `0.0`
+- `BOOLEAN`: `false`
+- `ARRAY`: `[]` (Any type of array will default to an empty one)
+- `DATETIME`: New instance of DateTime/DateTimeImmutable
+- `BACKEDENUM`: First case of the enum

docs/Quickstart.md

@@ -80,3 +80,4 @@ can be found here:
 - [Normalizers](https://github.com/nuxtifyts/php-dto/blob/main/docs/Normalizers.md)
 - [Property Attributes](https://github.com/nuxtifyts/php-dto/blob/main/docs/PropertyAttributes.md)
 - [Data Refiners](https://github.com/nuxtifyts/php-dto/blob/main/docs/DataRefiners.md)
+- [Empty Data](https://github.com/nuxtifyts/php-dto/blob/main/docs/EmptyData.md)