[gjs: 5/6] import Home documentation from the wiki

[Philip Chimento <pchimento src gnome org>]

commit f33c8571ae57c6a93875a1cba8a76416270480ce
Author: Sonny Piers <sonny fastmail net>
Date:   Fri Sep 20 00:54:32 2019 +0200

    import Home documentation from the wiki

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+# GJS: Javascript Bindings for Gnome
+
+The current stable series (1.50.x) is built on Mozilla's SpiderMonkey 52 featuring **ES6 (ECMAScript 2015)** 
and GObjectIntrospection making most of the **Gnome API library** available.
+
+To find out when a language feature was implemented in GJS, review [NEWS][gjs-news] in the GitLab 
repository. In many cases older versions of GJS can be supported using [polyfills][mdn-polyfills] and 
[legacy-style GJS classes](Modules#lang).
+
+GJS includes some built-in modules like Cairo and Gettext, as well as helpers for some core APIs like DBus 
and Variants. See the [Modules](Modules) page for an overview of the built-in modules and their usage.
+
+[gjs-news]: https://gitlab.gnome.org/GNOME/gjs/raw/master/NEWS
+[mdn-polyfills]: https://developer.mozilla.org/docs/Glossary/Polyfill
+
+## Gnome API Documentation
+
+There is now official [Gnome API Documentation][gjs-docs] for GJS, including everything from GLib and Gtk to 
Soup and WebKit2.
+
+The [Mapping](Mapping) page has an overview of Gnome API usage in GJS such as subclassing, constants and 
flags, functions with multiple return values, and more.
+
+There are also a growing number of [examples][gjs-examples] and thorough tests of language features in the 
[test suite][gjs-tests].
+
+[gjs-docs]: https://gjs-docs.gnome.org/
+[gjs-examples]: https://gitlab.gnome.org/GNOME/gjs/tree/master/examples
+[gjs-tests]: https://gitlab.gnome.org/GNOME/gjs/blob/master/installed-tests/js
+
+
+
+## Standalone Applications
+
+It's possible to write standalone applications with GJS for the Gnome Desktop, and infrastructure for 
Gettext, GSettings and GResources via the `package` import. There is a package specification, template 
repository available and plans for an in depth tutorial.
+
+* [GJS Package Specification](https://wiki.gnome.org/Projects/Gjs/Package)
+* [GJS Package Template](https://github.com/gcampax/gtk-js-app)
+
+Gnome Applications written in GJS:
+
+* [Gnome Characters](https://gitlab.gnome.org/GNOME/gnome-characters)
+* [Gnome Documents](https://gitlab.gnome.org/GNOME/gnome-documents)
+* [Gnome Maps](https://gitlab.gnome.org/GNOME/gnome-maps)
+* [Gnome Sound Recorder](https://gitlab.gnome.org/GNOME/gnome-sound-recorder)
+* [Gnome Weather](https://gitlab.gnome.org/GNOME/gnome-weather)
+* [Polari](https://gitlab.gnome.org/GNOME/polari) IRC Client
+
+## Getting Help
+
+* Mailing List: http://mail.gnome.org/mailman/listinfo/javascript-list
+* IRC: irc://irc.gnome.org/#javascript
+* Issue/Bug Tracker: https://gitlab.gnome.org/GNOME/gjs/issues
+* StackOverflow: https://stackoverflow.com/questions/tagged/gjs
+
+## External Links
+
+* [GObjectIntrospection](https://wiki.gnome.org/action/show/Projects/GObjectIntrospection)
+* [Gnome Developer Platform Demo](https://developer.gnome.org/gnome-devel-demos/stable/js.html) (Some older 
examples that still might be informative)
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