Update readme

Author: sadekd

README.md

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+# Nova Opening Hours Field
+
+Laravel Nova custom field for [Spatie Opening Hours](https://github.com/spatie/opening-hours)
+
+## Installation
+
+You can install the package in to a Laravel app that uses [Nova](https://nova.laravel.com) via composer:
+
+```bash
+composer require sadekd/nova-opening-hours-field
+```
+
+## Usage
+
+Laravel Model
+
+```php
+protected $casts = [
+    'opening_hours' => 'array',
+];
+```
+
+Nova Resource
+
+```php
+public function fields(Request $request)
+{
+    return [
+        ID::make(),
+        NovaOpeningHoursField::make('opening_hours'),
+        ...
+```
+
+## TODO
+
+- [ ] Explode interval input => time fields
+- [ ] Validation
+- [ ] Localization
+- [ ] Exceptions
+- [ ] Tests
+
+## License
+
+The MIT License (MIT). Please see [License File](LICENSE.md) for more information.