Added documentation for tls_set in README.md

[Sohaib90]

I just wanted to ask for improvements and suggestions when adding the recent changes to the README.md
If this is alright (for now, just tls_set example added) I can add the proxy settings as well

[frederikaalund]

Thank you for opening this PR. Let me have a look. :)

Looks good and I think that it will help our users with the recently-added functionality (thanks again on that part).

One minor nitpick: Let's send the example code through Black first. When that is done, I'll merge this. 👍

[Sohaib90]

Hmmm, do I have to use black on the README.md or just the example code part and then commit that?

[frederikaalund]

Just the example code, thanks. :) It formats python code in a standard way. IMHO, it's a good idea to run it on all python code that goes into this repo.

[Sohaib90]

Just added the formatted example code. If this is alright, I would also like to add the proxy_set information and commit that in this PR

[frederikaalund]

Looks great, thanks!

If this is alright, I would also like to add the proxy_set information and commit that in this PR

Please, by all means go ahead. :)

[Sohaib90]

@frederikaalund I have added the documentation for the proxy settings as well. It is complete now

[frederikaalund]

LGTM. This will definitely help our users since we were pretty light on the documentation beforehand. Thanks again for your contribution to asyncio-mqtt. 👍

[Sohaib90]

It was my pleasure :)
Might contribute in the future as well

[frederikaalund]

Looking forward to that. Thanks again! 👍