Timekeeper

Introduction
The timekeeper is responsible to track how long each participant of a meeting speaks. They notifies the speaker when they reach and exceed their speaking time, and present a report about the measured timing at the end of the meeting.

Before the meeting
Prepare the following material (or get it from the Sergean at Arms):
 * A timing device: stopwatch, clock app of a mobile phone, etc
 * A way to notify the speakers when their mimimum, maximum and in between time are reached.