Update README and add CHANGELOG

[Namoshek]

This PR prepares a release candiate for v1.0.0 by adding a thorough changelog. The readme is updated as well, with slight changes only though. Before this gets merged, more examples are to be added in the php-mqtt/client-examples repository.

TODO:

• Examples added
  • Publish with QoS 0
  • Publish with QoS 1 (and exit loop as soon as queues are empty)
  • Publish with QoS 2 (and exit loop as soon as queues are empty)
  • Subscribe with QoS 0
  • Subscribe with QoS 1
  • Subscribe with QoS 2
  • Connect using username and password for authorization
  • Connect using TLS without client certificate
  • Connect using TLS with client certificate
  • Last Will
  • Use Loop Hook
  • Use Publish Hook
  • Use Message Received Hook
  • Use interrupt to exit loop

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