Add submission # 4770

#4770

Author: ArduinoBot

registry.txt

@@ -7261,3 +7261,4 @@ https://github.com/orcadom/DS4.git|Contributed|DS4
 https://github.com/SeeedJP/wio_cellular.git|Contributed|Wio Cellular
 https://github.com/drrnb/SingleSevenSegment.git|Contributed|SingleSevenSegment
 https://github.com/makerlabvn/MKL_DHT.git|Contributed|MKL_DHT sensor library
+https://github.com/RBEGamer/HLK-LD2450.git|Contributed|HLK-LD2450