Added Polish translation

README.md

@@ -29,6 +29,7 @@ if you need some help getting it setup.
 * [German/Deutsch](http://www.sqlstyle.guide/de/) by [AStasyK](https://github.com/AStasyK)
 * [Italian/Italiano](http://www.sqlstyle.guide/it/) by [robertopauletto](https://github.com/robertopauletto)
 * [Japanese/日本語](http://www.sqlstyle.guide/ja/) by [nkurigit](https://github.com/nkurigit)
+* [Polish/Polski](http://www.sqlstyle.guide/pl/) by [andre-wojtowicz](https://github.com/andre-wojtowicz)
 * [Portuguese (Brazil)/Português (BR)](http://www.sqlstyle.guide/pt-br/) by [pmarcus93](https://github.com/pmarcus93)
 * [Russian/Русский](http://www.sqlstyle.guide/ru/) by [denpatin](https://github.com/denpatin)
 * [Turkish/Türkçe](http://www.sqlstyle.guide/tr/) by [mrfade](https://github.com/mrfade)

_config.yml

@@ -35,6 +35,9 @@ langs:
     ja:
         ja: 日本語
         en: Japanese
+    pl:
+        pl: Polski
+        en: Polish
     pt-BR:
         pt-BR: Português (BR)
         en: Portuguese - Brazil

pl/index.md

@@ -0,0 +1,13 @@
+---
+layout: default
+lang: pl
+lang_title: Podręcznik stylu SQL
+contributors:
+    - user: andre-wojtowicz
+      type: translator
+---
+
+* TOC
+{:toc}
+
+{% include sqlstyle.guide.pl.md %}