Added additional logging, ACK responses to MQTT server messages and Asynch mode so processing continues once a connection is established.

Minor READMe update

Implement message ACK handling

Handle SubAck, document requirement for QOS1 in subscribe messages.

Merge branch 'main' of https://github.com/oreillymj/netty-mqtt-websocket-client

Reverse logic in IF/ELSE to make it clearer the response we expect.

Reverse logic in IF/ELSE to make it cealrer the respnse we expect.

Define constant for Webscoket HTTP response code

Fix typo, update known issues.

Added Proxy support

Added user authentication support, shutdown if auth fails.

Add SSL helper class and SSL example to READMe

Added Docker file to start a local Mosquitto instance supportting Websockets on port 9001

Further README cleanup

Some README cleanup