Update repositories.txt (#6375)

Added link to OTA_Template Library providing ota enabled app framework including node.js ota-server and Web Configuration pages for all relevant config data. Tested on ESP8266 and ESP32 derivates

Author: rzuehlsd

repositories.txt

@@ -8082,3 +8082,4 @@ https://github.com/k3ldar/MovementDetector
 https://github.com/marcel-naderer/Lexo
 https://github.com/joshua-8/xrp-style-wpilib-comms
 https://github.com/bitbank2/bb_imu
+https://github.com/rzuehlsd/OTA-Template