This plugin sets up a coupon on installation and sends this coupon to a
user that asks for it. The plugin supports an expiration period. After
this period, it will renew the coupon.
This commit adds a convenient installation script for Linux and also
adds a description on how to install the bot.
Furthermore, a very simple example plugin is added. This way, new users
can easily discover the possibilities of this plugin.
Finally, the default character "Peter"---which is used within
Alcuinus---is removed, and a more generic character is added.