Add support for HACS

[mtdcr]

Have you considered submitting your repository to HACS to improve discoverability of your integration?

Quoting from https://github.com/hacs/default#readme:

If you want to publish your repositories as default in HACS have a look here:

• https://hacs.xyz/docs/publish/start
• https://hacs.xyz/docs/publish/include

[alexmohr]

I still have concerns that the library is missing too many features to be really usable for a wider audience. At least the input selection should be implemented for that but I did not found any time to do that.

[Liborsaf]

I would also appreciate this 😄