README.md: Add Travis-CI build status icon, add general Ayatana Indicators information.

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-# Ayatana System Indicator — Session
+# Ayatana System Indicator — Session [![Build Status](https://travis-ci.com/AyatanaIndicators/ayatana-indicator-session.svg)](https://travis-ci.com/AyatanaIndicators/ayatana-indicator-session)
+
+## About Ayatana Indicators
+
+The Ayatana Indicators project is the continuation of Application
+Indicators and System Indicators, two technologies developed by Canonical
+Ltd. for the Unity7 desktop.
+
+Application Indicators are a GTK implementation of the StatusNotifierItem
+Specification (SNI) that was originally submitted to freedesktop.org by
+KDE.
+
+System Indicators are an extensions to the Application Indicators idea.
+System Indicators allow for far more widgets to be displayed in the
+indicator's menu.
+
+The Ayatana Indicators project is the new upstream for application
+indicators, system indicators and associated projects with a focus on
+making Ayatana Indicators a desktop agnostic technology.
+
+On GNU/Linux, Ayatana Indicators are currently available for desktop
+envinronments like MATE (used by default in [Ubuntu
+MATE](https://ubuntu-mate.com)), XFCE (used by default in
+[Xubuntu](https://bluesabre.org/2021/02/25/xubuntu-21-04-progress-update/),
+LXDE, and the Budgie Desktop.
+
+The Lomiri Operating Environment (UI of the Ubuntu Touch OS, formerly
+known as Unity8) uses Ayatana Indicators for rendering its notification
+area and the [UBports](https://ubports.com) project is a core contributor
+to the Ayatana Indicators project.
+
+For further info, please visit:
+https://ayatana-indicators.org
+
+
+## The Session Ayatana System Indicator
 
 The -session Ayatana System Indicator is the session menu indicator for
 Unity7, MATE and Lomiri (optionally for others, e.g. XFCE, LXDE). Its