Added GPGS

docs/en/en.json

@@ -532,6 +532,10 @@
                         "path": "/manuals/instant-games",
                         "name": "Facebook Instant Games"
                     },
+                    {
+                        "path": "/manuals/gpgs",
+                        "name": "Google Play Game Services"
+                    },
                     {
                         "path": "/manuals/iap",
                         "name": "In-app purchases"

docs/en/manuals/gpgs.md

@@ -0,0 +1,21 @@
+---
+title: Google Play Game Services in Defold
+brief: This document describes how to set up and use Google Play Game Services
+---
+
+# Google Play Game Services
+
+[Google Play Game Services](https://developers.google.com/games/services) adds use authentication, cloud save, achievements, leaderboards and more to your Android game. Google Play Game Services is available as a [native extension](/manuals/extensions/).
+
+## Installing the extension
+
+To start using the Google Play Game Services extension you need to add it as a dependency to your `game.project` file. The latest stable version is available with the dependency URL:
+```
+https://github.com/defold/extension-gpgs/archive/master.zip
+```
+
+We recommend using a link to a zip file of a [specific release](https://github.com/defold/extension-gpgs/releases).
+
+## Using the extension
+
+Usage instructions and API reference is available on the [extension GitHub page](https://defold.github.io/extension-gpgs/).