Add https://github.com/Johboh/ieee-802_15_4/ (#6262)

Author: Johboh

repositories.txt

@@ -3335,6 +3335,7 @@ https://github.com/Johboh/EspNowNetworkNode
 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/MQTTRemote
 https://github.com/Johboh/nlohmann-json
 https://github.com/John-Karatka/24LC64F