Add chapter: How to use the client

[Ynda]

I want to use the ContaoMonitoring Tools, but have some Problems to get the monitoring-client work together with the monitoring-server.

[cliffparnitzky]

The client is currently not final released. Everything relates to this issue: ContaoMonitoring/monitoring#10

Please follw this issue and/or twitter to get informed, when is available.

[cliffparnitzky]

Detail infos:

Admin manual

• how to install (client / server side)
• how to configure
• how to use (server side)

Developer manual

• add sensor (explain hook)
• add worker (explain hook)