readme.md update request

[whiteduck22]

Hi @DanielOgorchock

Thanks for a great way to integrate a Raspi with ST. Being an ST newbie I found that a step missing when adding your repository is you need to tell ST to integrate with Github first and then link it to my own individual GitHub account before you can then add your repository. It probably sounds obvious but Settings under Device Handlers doesn't appear until you do. Then i found ST struggles to download all of the handlers from GitHub and after publishing many go back to unpublished - I don't know if this is an issue or not.

Please could you also include instructions in the readme.md on how you could integrate features of the Raspi such as disk space/cpu usage etc. and return them to ST and also to allow different icons.

It is not obvious how to ask OmniThing to re-read it's .json configuration so I send a kill -HUP.

Finally in ST I found the Configure icon doesn't do anything - is this intended?

All these points would be really useful if we can address them in readme.md.

Thanks a lot Ian