Add NuSock library link (#7365)

* Update repositories.txt

Add https://github.com/mobizt/ReadyMail repository

* Add SerialTCPClient repository

* Add SerialNetworkBridge repository

* Add NuSock repository link

Author: mobizt

repositories.txt

@@ -4769,6 +4769,7 @@ https://github.com/mobizt/FirebaseJson
 https://github.com/mobizt/ReadyMail
 https://github.com/mobizt/SerialTCPClient
 https://github.com/mobizt/SerialNetworkBridge
+https://github.com/mobizt/NuSock
 https://github.com/modulolabs/modulo-lib
 https://github.com/mogel77/Jobber
 https://github.com/MohammedRashad/ArduZ80