docs: Add a homepage for the documentation

Fixes #20

docs/index.rst

@@ -10,3 +10,45 @@ Blueprint is a markup language and compiler for GTK 4 user interfaces.
    setup
    examples
 
+
+.. code-block::
+
+   using Gtk 4.0;
+
+   template MyAppWindow : ApplicationWindow {
+     default-width: 600;
+     default-height: 300;
+     title: _("Hello, Blueprint!");
+
+     [titlebar]
+     HeaderBar {}
+
+     Label {
+       label: bind MyAppWindow.main_text sync-create;
+     }
+   }
+
+Blueprint helps you build user interfaces in GTK quickly and declaratively.
+It has modern IDE features like code completion and hover documentation, and
+the compiler points out mistakes early on so you can focus on making your app
+look amazing.
+
+Features
+--------
+
+- **Easy setup.** A porting tool is available to help port your projects from
+  XML. The compiler's only dependency is Python, and it can be included as
+  a meson subproject. :doc:`See the Setup page for more information. <setup>`
+- **Concise syntax.** No more clumsy XML! Blueprint is designed from the ground
+  up to match GTK's widget model, including templates, child types, signal
+  handlers, and menus.
+- **Easy to learn.** The syntax should be very familiar to most people. Scroll
+  through the :doc:`examples page <examples>` for a quick overview of the whole
+  language.
+- **Modern tooling.** IDE integration for `GNOME Builder <https://developer.gnome.org/documentation/introduction/builder.html>`_
+  is in progress, and a VS Code extension is also planned.
+
+Links
+-----
+
+- `Source code <https://gitlab.gnome.org/jwestman/blueprint-compiler>`_