Better examples for readme

[randytsuch]

I suggest adding better examples to the readme

From AVR3312CI_AVR3312_PROTOCOL_V7.6.0.pdf, starting at page 7, if you use the Example column minus in the denon-out node command field, it seems like you can send any command to the denon in a flow.

From page 11, if I send a command of MSPURE DIRECT then my Denon X4500H goes into direct sound mode. Command of MSDOLBY DIGITAL and it goes into Dolby Digital mode

From page 8, if I send command of SIDVD then Denon selects input source DVD
SICD selects CD for source, etc.

I've also tried the zone 2 and 3 commands, and they will work this way.

This make is easy to put the commands in a flow. I made a flow to turn on the Denon, wait a second, set source to CD and set sound mode to MSPURE DIRECT.

It would be more convenient if the out node had an output so you could link commands and send them sequentially.

For installation, you should add that you need git installed as a dependency.