Update README.md

Add Battery charging thresholds feature deprecation notice

README.md

@@ -541,6 +541,8 @@ If the daemon has been installed, live stats of CPU/system load monitoring and o
 
 ## Battery charging thresholds
 
+***__Please note:**__ This feature is **deprecated**, as its [original implementor](https://github.com/AdnanHodzic/auto-cpufreq/pull/637) is no longer actively working on it. If you would like to further improve this functionality, please refer to [Looking for developers and co-maintainers](https://github.com/AdnanHodzic/auto-cpufreq/#looking-for-developers-and-co-maintainers).*
+
 As of [v2.2.0](https://github.com/AdnanHodzic/auto-cpufreq/releases/tag/v2.2.0), battery charging thresholds can be set in the config file. This enforces your battery to start and stop charging at defined values
 
 ### Supported devices