update doc

README.md

@@ -1,16 +1,38 @@
 # Khmer Lunar Date with Carbon
 
+# Installation
+
+```bash
+composer require chanthorn/carbon-kh
+```
+
 # Usage
 
 ```php
 require_once __DIR__ . '/vendor/autoload.php';
 
 use Carbon\Carbon;
-$date = Carbon::parse('2023-01-01');
-$khmerDate = new ToKhmerDate($date);
-echo $khmerDate->format();
+use Chanthorn\CarbonKh\ToKhmerDate;
+
+    $date = Carbon::parse('2023-01-01');
+    $khmerDate = new ToKhmerDate($date);
+
+    echo $khmerDate::format(); // ថ្ងៃអាទិត្យ ១០កើត ខែបុស្ស ឆ្នាំខាល ចត្វាស័ក ពុទ្ធសករាជ ២៥៦៦
+    echo $khmerDate::format('dN ថ្ងៃW ខែm ព.ស. b'); // ១០កើត ថ្ងៃអាទិត្យ ខែបុស្ស ព.ស. ២៥៦៦
+
+    print_r($khmerDate::khNewYear());
+    // array:3 [
+    //   "date" => Carbon\Carbon
+    //   "days" => 3
+    //   "dates" => array:3
+    // ]
+
 ```
 
-# Author
+## Format
+
+Check out format [here](https://github.com/ThyrithSor/momentkh#format)
+
+# Authors
 
 - This library is Ported from [khmercal](https://github.com/seanghay/khmercal) by [Seanghay](https://github.com/seanghay) and [momentkh](https://github.com/ThyrithSor/momentkh) by [Thyrith Sor](https://github.com/ThyrithSor) in to PHP.