Update README.md for the new zha library

[Hedda]

Update README.md for the new zha library to add some basic information now it will be used in Home Assistant 2024.8 soon.

References;

• https://rc.home-assistant.io/blog/2024/07/31/release-20248/#zigbee-home-automation-zha-updates
• ZHA as an external library home-assistant/core#120190
• Initial standalone version #6
• ZHA (and zigpy) roadmap for "ZHA WS" client addon for integration and external/stand-alone ZHA Gateway WebSocket Server application? zigpy#1207

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.68%. Comparing base (4258c27) to head (ec626d8).
Report is 28 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #131      +/-   ##
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- Coverage   95.68%   95.68%   -0.01%     
==========================================
  Files          61       61              
  Lines        9255     9273      +18     
==========================================
+ Hits         8856     8873      +17     
- Misses        399      400       +1     

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[puddly]

I don't think Back-story and everything below it belong in the README, they add needless verbosity.

[Hedda]

I don't think Back-story and everything below it belong in the README, they add needless verbosity.

OK removed that section now, however added an additional line to the introduction to highlight potential other uses.

[puddly]

We're going to take a different direction with the ZHA README.