[LED] Add power pin to addressable LED (#2056)

Co-authored-by: Florian <1technophile@users.noreply.github.com>

lib/LEDManager/README.md

@@ -30,6 +30,9 @@ build_flags =
     -DLED_ADDRESSABLE=true
     ; For non-addressable LEDs, comment out the line above
     
+    ; If the Addressable LED requires power
+    -DLED_ADDRESSABLE_POWER=15
+
     ; Optional timing configurations:
     -DBLINK_INTERVAL=500
     -DPULSE_INTERVAL=30