Update repositories.txt (#7121)

added library KK-Buffer

Author: kay-bs

repositories.txt

@@ -8494,6 +8494,7 @@ https://github.com/Alteriom/painlessMesh
 https://github.com/mitra42/frugal-iot
 https://github.com/eakse/ESP32S3_SUPERMINI_PINOUT
 https://github.com/kay-bs/KK-Switch
+https://github.com/kay-bs/KK-Buffer
 https://github.com/localrice/EasyWiFi
 https://github.com/7semi-solutions/7Semi_RS485_Temperature-Humidity-Arduino-Library
 https://github.com/7semi-solutions/7Semi_CO2_Temperature_Humidity_I2C_Probe_Arduino_Library