Add shell script to enable demo mode for e.g. creating screenshots

[ci skip]

Author: SailReal

demo-mode.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+adb shell settings put global sysui_demo_allowed 1 
+
+adb shell am broadcast -a com.android.systemui.demo -e command clock -e hhmm 1200
+adb shell am broadcast -a com.android.systemui.demo -e command network -e mobile show -e level 4 -e datatype false
+adb shell am broadcast -a com.android.systemui.demo -e command notifications -e visible false
+adb shell am broadcast -a com.android.systemui.demo -e command battery -e plugged false -e level 100