Add https://github.com/Johboh/ieee-802_15_4-network-shared (#6263)

Author: Johboh

repositories.txt

@@ -3336,6 +3336,7 @@ https://github.com/Johboh/EspNowNetworkShared
 https://github.com/Johboh/GCMEncryption
 https://github.com/Johboh/HomeAssistantEntities
 https://github.com/Johboh/ieee-802_15_4/
+https://github.com/Johboh/ieee-802_15_4-network-shared
 https://github.com/Johboh/MQTTRemote
 https://github.com/Johboh/nlohmann-json
 https://github.com/John-Karatka/24LC64F