[gnome-shell] extensions-app: Update README

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit c226081a23c34df708ec646017b688f3d164d652
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Mar 29 01:35:55 2020 +0100

    extensions-app: Update README
    
    Add the icon and use the app name instead of the subproject name.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1150

 subprojects/extensions-app/README.md |   5 +++--
 subprojects/extensions-app/logo.png  | Bin 0 -> 2365 bytes
 2 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/subprojects/extensions-app/README.md b/subprojects/extensions-app/README.md
index 55b9c8cf42..4aeceea3d1 100644
--- a/subprojects/extensions-app/README.md
+++ b/subprojects/extensions-app/README.md
@@ -1,5 +1,5 @@
-# gnome-extensions-app
-gnome-extensions-app is a small application for managing GNOME Shell
+# ![logo] GNOME Extensions
+GNOME Extensions is a small application for managing GNOME Shell
 extensions. It is usually built as part of gnome-shell, but can be
 used as a stand-alone project as well.
 
@@ -18,5 +18,6 @@ $ ./generate-translations.sh
 gnome-extensions-app is distributed under the terms of the GNU General Public
 License, version 2 or later. See the [COPYING][license] file for details.
 
+[logo]: logo.png
 [bug-tracker]: https://gitlab.gnome.org/GNOME/gnome-shell/issues
 [license]: COPYING
diff --git a/subprojects/extensions-app/logo.png b/subprojects/extensions-app/logo.png
new file mode 100644
index 0000000000..8872925e9f
Binary files /dev/null and b/subprojects/extensions-app/logo.png differ