add matter-extra-endpoints lib (#6388)

* Update repositories.txt

* Update repositories.txt - matter-extra-endpoints

Author: EatingJan1

repositories.txt

@@ -7966,6 +7966,7 @@ https://github.com/eccentricOrange/BIDFestTools
 https://github.com/dzalf/EEPROM_UID
 https://github.com/EatingJan1/MCHyetometer-REED
 https://github.com/EatingJan1/MCAnemometer-Ultrasonic
+https://github.com/EatingJan1/arduino-esp32-matter-extra-endpoints
 https://github.com/4211421036/YFS201
 https://github.com/nikachu2012/HttpCall
 https://github.com/AudunKodehode/JC3248W535EN-Touch-LCD