add example with key

Author: samsonasik

README.md

@@ -350,4 +350,10 @@ var_dump(Finder::rows(
     static fn ($datum): bool => $datum < 5,
     true
 )); // []
+
+// WITH key array included, pass $key variable as 2nd arg on  filter to be used in filter
+var_dump(Finder::rows(
+    $data,
+    static fn($datum, $key): bool => $datum > 6 && $key > 1
+)); // [8, 9]
 ```

tests/FinderTest.php

@@ -271,6 +271,11 @@ public static function rowsDataProvider(): array
                 static fn($datum): bool => $datum > 6,
                 [7, 8, 9],
             ],
+            [
+                [6, 7, 8, 9],
+                static fn($datum, $key): bool => $datum > 6 && $key > 1,
+                [8, 9],
+            ],
             [
                 [6, 7, 8, 9],
                 static fn($datum): bool => $datum < 5,