Merge pull request #185 from taha-moghaddam/patch-1

Update README.md

Author: morilog

README.md

@@ -393,6 +393,14 @@ $date = Jalalian::now()->lessThanOrEqualsToCarbon(Carbon::now()))
 
 ```
 
+---
+```php
+public function getFirstDayOfWeek(): bool
+
+$date = (new Jalalian(1403, 10, 14))->getFirstDayOfWeek()
+// output: 1403, 10, 8
+
+```
 ---
 ```php
 public function isStartOfWeek(): bool