Initial commit.

Creating the standard Autotools infrastructure and adding the
first extensions (the Hello, World! provided by the wizard).

extensions/example/Makefile.am

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+EXTENSION_ID = example
+
+include ../../extension.mk

extensions/example/extension.js

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+// Sample extension code, makes clicking on the panel show a message
+const St = imports.gi.St;
+const Mainloop = imports.mainloop;
+
+const Main = imports.ui.main;
+
+function _showHello() {
+    let text = new St.Label({ style_class: 'helloworld-label', text: "Hello, world!" });
+    let monitor = global.get_primary_monitor();
+    global.stage.add_actor(text);
+    text.set_position(Math.floor (monitor.width / 2 - text.width / 2), Math.floor(monitor.height / 2 - text.height / 2));
+    Mainloop.timeout_add(3000, function () { text.destroy(); });
+}
+
+// Put your extension initialization code here
+function main() {
+    Main.panel.actor.reactive = true;
+    Main.panel.actor.connect('button-release-event', _showHello);
+}

extensions/example/metadata.json

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+{"uuid": "example@gnome-shell-extensions.gnome.org", "name": "Hello, World!", "description": "An example extension to show how it works. Shows Hello, world when clicking on the top panel.", "shell-version": [ "2.91.5" ]}

extensions/example/stylesheet.css

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+/* Example stylesheet */
+.helloworld-label {
+    font-size: 36px;
+    font-weight: bold;
+    color: #ffffff;
+    background-color: rgba(10,10,10,0.7);
+    border-radius: 5px;
+}