first version with basic fan monitor

extension.js

@@ -0,0 +1,52 @@
+// Example #1
+
+const {St, Clutter, GLib} = imports.gi
+const Main = imports.ui.main
+const Mainloop = imports.mainloop
+const ByteArray = imports.byteArray
+
+let panelButton;
+
+
+const statuses = ["auto","fast","silent"]
+
+function init () {
+    // Create a Button with "Hello World" text
+    panelButton = new St.Bin({
+        style_class : "panel-button",
+    });
+
+    //Gio.monitor doesn't trigger. maybe it considier throttle_thermal_policy as a device ?
+    Mainloop.timeout_add(300, function () { 
+        update()
+        return true
+    });       
+    update()
+}
+
+function readFile() {
+    const array = GLib.file_get_contents("/sys/devices/platform/faustus/throttle_thermal_policy")[1]
+    const status = parseInt(ByteArray.toString(array))
+    GLib.free(array)
+    return status
+}
+
+function update() {
+    const status = readFile();
+    let panelButtonText = new St.Label({
+        text : statuses[status],
+        y_align: Clutter.ActorAlign.CENTER,
+    });
+    panelButton.set_child(panelButtonText);
+}
+
+function enable () {
+    // Add the button to the panel
+    Main.panel._rightBox.insert_child_at_index(panelButton, 0);
+}
+
+function disable () {
+    // Remove the added button from panel
+    Main.panel._rightBox.remove_child(panelButton);
+}
+