[gtk-web/new-website] docs: Flesh out the "Getting Started" landing page

[Emmanuele Bassi <ebassi src gnome org>]

commit 2f2cf6cc1ad3013494c69e4240237403e7d49707
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Jan 29 17:00:34 2020 +0100

    docs: Flesh out the "Getting Started" landing page

 collections/_docs/getting-started.md | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)
---
diff --git a/collections/_docs/getting-started.md b/collections/_docs/getting-started.md
index ca46139..c49bdbd 100644
--- a/collections/_docs/getting-started.md
+++ b/collections/_docs/getting-started.md
@@ -1,4 +1,30 @@
 ---
 permalink: /docs/:name/
 ---
-started
\ No newline at end of file
+
+## Getting Started with GTK
+
+GTK is a [widget toolkit](https://en.wikipedia.org/wiki/Widget_toolkit).
+Each user interface created by GTK consists of UI elements known as *widgets*.
+
+The GTK programming interface is based on [Object
+Orientation](https://en.wikipedia.org/wiki/Object-oriented_design); widgets
+are organized in a *hierarchy* of classes—for instance, the window widget is
+also a specialised container, called a "bin", that can hold at most one child
+widget. A window will be able to use functions that pertain to the widget,
+container, bin, and window classes.
+
+Each user interface is built by adding buttons, text labels, input fields,
+drop down menus, and other widgets to a window.
+
+If you are creating complex user interfaces, it is recommened to describe
+the structure of your window using the [GtkBuilder][builder] XML description
+format, instead of assembling it manually. You can also use a visual UI
+editor that will generate the XML for your, like [Glade][glade].
+
+GTK is [event-driven](https://en.wikipedia.org/wiki/Event-driven_programming).
+The toolkit listens for events such as a pointer click on a button, or a
+window resize, and notifies the widgets in your application.
+
+[builder]: https://developer.gnome.org/gtk3/stable/GtkBuilder.html
+[glade]: https://glade.gnome.org