Add writeln function

Author: klimick

composer.json

@@ -96,6 +96,7 @@
             "src/Fp/Functions/Evidence/ProveString.php",
             "src/Fp/Functions/Util/JsonDecode.php",
             "src/Fp/Functions/Util/RegExp.php",
+            "src/Fp/Functions/Util/Writeln.php",
             "src/Fp/Functions/Panic.php",
             "src/Fp/Functions/Id.php",
             "src/Fp/Functions/Unit.php"

src/Fp/Functions/Util/Writeln.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Fp\Util;
+
+use const PHP_EOL;
+
+function writeln(string $text): void
+{
+    print_r($text . PHP_EOL);
+}

tests/Runtime/Functions/Util/WritelnTest.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Runtime\Functions\Util;
+
+use Fp\Functional\Option\Option;
+use PHPUnit\Framework\TestCase;
+
+use function Fp\Util\regExpMatch;
+use function Fp\Util\writeln;
+use const PHP_EOL;
+
+final class WritelnTest extends TestCase
+{
+    public function testWriteln(): void
+    {
+        writeln('Hi!');
+        $this->expectOutputString('Hi!' . PHP_EOL);
+    }
+}