Add documentation for NameMapper attribute

Introduce a new `NameMapper.md` file explaining the usage of the `MapName` attribute for handling property name mapping and letter case transformations. Update cross-references in `PropertyAttributes.md` and `Quickstart.md` to include this new documentation.

Author: Fa-BRAIK

docs/NameMapper.md

@@ -0,0 +1,36 @@
+Name Mapper
+=
+
+Sometimes we could be expecting payload with different letter case or different naming convention. 
+In such cases, we can use the `NameMapper` attribute to map the property to the correct key in the data array.
+
+```php
+use Nuxtifyts\PhpDto\Data;
+use Nuxtifyts\PhpDto\Attributes\Class\MapName;
+use Nuxtifyts\PhpDto\Enums\LetterCase;
+
+#[MapName(from: [LetterCase::KEBAB, LetterCase::SNAKE])]
+final readonly class UserData extends Data
+{
+    public function __construct(
+        public string $firstName,
+        public string $lastName
+    ) {}
+}
+```
+
+In the above example, passed data with keys `letter_case` and `letter-case` will be mapped to `letterCase` (By default),
+and all of these keys will be transformed to the selected letter case.
+
+```php
+$user = UserData::from([ 'first-name' => 'John', 'last_name': 'Doe' ]);
+```
+
+> **Note:** The `MapName` attribute is applied on every key in the data array.
+
+`MapName` attribute accepts these params: 
+
+| Param  | Type                             | Description                      | Default           |
+|--------|----------------------------------|----------------------------------|-------------------|
+| `from` | `LetterCase`\|`list<LetterCase>` | List of letter cases to map from | -                 |
+| `to`   | `LetterCase`                     | Letter case to map to            | LetterCase::CAMEL |

docs/PropertyAttributes.md

@@ -80,6 +80,11 @@ final readonly class PersonData extends Data
 
 This will make it possible to hydrate properties from multiple array keys.
 
+> **Note:** Sometimes, we may want to apply the `Aliases` attribute to the whole class,
+> in case we want to transform letter cases of all the keys in data array.
+> In such cases, we can use the [MapName](https://github.com/nuxtifyts/php-dto/blob/main/docs/NameMapper.md)
+> attribute.
+
 CipherTarget
 -
 

docs/Quickstart.md

@@ -78,6 +78,7 @@ can be found here:
 - [Supported Types](https://github.com/nuxtifyts/php-dto/blob/main/docs/SupportedTypes.md)
 - [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)
+- [Name Mapper](https://github.com/nuxtifyts/php-dto/blob/main/docs/NameMapper.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)
 - [Cloneable Data](https://github.com/nuxtifyts/php-dto/blob/main/docs/CloneableData.md)