Update repositories.txt (#2230)

* Update repositories.txt

* fix: add new line

Author: neosarchizo

repositories.txt

@@ -5422,3 +5422,4 @@ https://github.com/khoih-prog/ESP32_Ethernet_Manager
 https://github.com/khoih-prog/AsyncESP8266_Ethernet_Manager
 https://github.com/khoih-prog/ESP8266_Ethernet_Manager
 https://github.com/dvarrel/ESP_Ping
+https://github.com/neosarchizo/am1002-uart