[connections.wiki] Add some overview of the app's architecture/structure

[Felipe Borges <felipeborges src gnome org>]

commit 22e4345f66b740ec14036d903611aff71428eff9
Author: Felipe Borges <felipeborges gnome org>
Date:   Fri Jul 1 09:23:30 2022 +0000

    Add some overview of the app's architecture/structure

 home.md | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/home.md b/home.md
index 2f3976a..aad7371 100644
--- a/home.md
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@@ -1,3 +1,13 @@
 # Welcome to Connections
 
-A remote desktop client for the GNOME desktop environment.
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+A remote desktop client for the GNOME desktop environment.
+
+This is the developer documentation. For user documentation visit 
https://gitlab.gnome.org/GNOME/connections/-/tree/master/help
+
+## Overview
+
+Connections is designed to split remote-connection specifics from the frontend. For this reason it is 
expected that most of the protocol specific work is done in the remote connection display widget libraries 
such as [Gtk-Vnc](https://gitlab.gnome.org/GNOME/gtk-vnc) and 
[Gtk-Frdp](https://gitlab.gnome.org/GNOME/gtk-frdp/). Making this repository mostly for the app/frontend 
logic.
+
+The `VncConnection` and `RdpConnection` classes are derived from the `Connection` abstract class, which 
implements some of the functionality that applies to all protocols and relies heavily on its properties being 
serializable. This way, the `Database` singleton object manages the collection of remote connections data by 
serializing a `Connection` object's [properties to/from a 
Keyfile](https://gitlab.gnome.org/GNOME/connections/-/blob/master/src/database.vala#L154). This mechanism 
allows for `Connection` properties to be always in sync with the disk.
+
+`VncPreferencesWindow` and `RdpPreferencesWindow` derive from the `PreferencesWindow` class. These dialogs 
basically bind the `Connection` properties to the widgets that allow for editing them. Edits get 
automatically synchronized with their respective `Connection` object and consequently saved to disk.
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