feat: add PL translations

.gitignore

 .idea
+lang
+!lang/*_*.po

composer.json

@@ -15,5 +15,12 @@
       "type" : "composer",
       "url" : "https://gitlab.wpdesk.dev/Dworowy/xxx-hello-world.git"
     }
+  },
+  "extra": {
+    "text-domain": "mdworowy-hello-world",
+    "translations-folder": "lang",
+    "po-files": {
+      "pl_PL": "pl_PL.po"
+    }
   }
 }

src/HelloWorld.php

@@ -4,6 +4,6 @@ namespace HelloWorld;
 
 final class HelloWorld {
 	public static function printHello(): string {
-		return "Hello World!";
+		return __("Hello World!", 'mdworowy-hello-world');
 	}
 }