[gnome-flashback/feature/add-readme-md] README.md: add simple documentation

[Sebastian Geiger <segeiger src gnome org>]

commit 22915fa18cf840d1dc0b3b1d69c9d2af70017279
Author: Sebastian Geiger <sbastig gmx net>
Date:   Fri May 14 14:09:35 2021 +0200

    README.md: add simple documentation

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+See README.md
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+# About
+
+GNOME Flashback is the backend of the GNOME Flashback desktop session. It 
+provides the `gnome-flashback` and `gnome-flashback-clipboard` programs.
+In addition, GNOME Flashback contains the `system-indicators` library.
+
+## gnome-flashback
+
+The `gnome-flashback` program contains a set of D-Bus backends that are used by
+the GNOME Flashback desktop, they include the following:
+
+* Accessibility Keyboard
+* Audio Device Selection
+* Automount Manager
+* Desktop
+* End Session Dialog
+* Idle Monitor
+* Input Settings
+* Input Sources
+* Notifications
+* Policykit
+* Root Background
+* Screencast
+* Screensaver
+* Screenshot
+* Shell
+* Sound Applet
+* Status Notifier Watcher
+
+## Daemons
+
+The `gnome-flashback-clipboard` is a daemon that provices clipboard
+functionality.
+
+## System Indicators
+
+The `system-indicators` is a module that can be loaded by GNOME Panel
+to display various system indicators such as:
+
+* Bluetooth
+* Desktop Menu Items
+* Indicators
+* Power
+* Volume Settings
+
+# Releases
+
+You may download gnome-panel releases and updates from the
+[release server](http://download.gnome.org/sources/gnome-flashback/)
+
+# Discussions
+
+To discuss gnome-panel, you may use the
+[gnome-flashback-list](http://mail.gnome.org/mailman/listinfo/gnome-flashback-list) mailing list.
+
+# How to report bugs
+
+Bugs should be reported in the issue section of
+[GNOME Gitlab](https://gitlab.gnome.org/GNOME/gnome-flashback/issues)
+
+You will need to create an account for yourself.
+
+Please read the HACKING file for information on where to send changes or
+bugfixes for this package.