Add SerialNetworkBridge repository

Author: mobizt

repositories.txt

@@ -4751,6 +4751,7 @@ https://github.com/mobizt/Firebase-ESP8266
 https://github.com/mobizt/FirebaseJson
 https://github.com/mobizt/ReadyMail
 https://github.com/mobizt/SerialTCPClient
+https://github.com/mobizt/SerialNetworkBridge
 https://github.com/modulolabs/modulo-lib
 https://github.com/mogel77/Jobber
 https://github.com/MohammedRashad/ArduZ80