Create pt-pt.md (#1051)

* Create pt-pt.md

* Update and rename pt-pt.md to pt.md

According to Adão pt means portugal, so no need for pt pt, unless it means Portuguese from Porto, Portus Calle

* Update README.md

README.md

@@ -24,6 +24,7 @@
   <a href="docs/i18n/README.zh.md">🇨🇳 中文</a> •
   <a href="docs/i18n/README.zh-tw.md">🇹🇼 繁體中文</a> •
   <a href="docs/i18n/README.ja.md">🇯🇵 日本語</a> •
+  <a href="docs/i18n/README.pt.md">🇵🇹 Português</a> •
   <a href="docs/i18n/README.pt-br.md">🇧🇷 Português</a> •
   <a href="docs/i18n/README.ko.md">🇰🇷 한국어</a> •
   <a href="docs/i18n/README.es.md">🇪🇸 Español</a> •