Update repositories.txt (#5563)

Author: krosDC

repositories.txt

@@ -6,6 +6,7 @@ https://github.com/DigitalCodesign/MentorBit-DetectorIR
 https://github.com/DigitalCodesign/MentorBit-DetectorLluvia
 https://github.com/DigitalCodesign/MentorBit-DHT11
 https://github.com/DigitalCodesign/MentorBit-DHT22
+https://github.com/DigitalCodesign/MentorBit-Encoder
 https://github.com/median-dispersion/Non-Blocking-Melody
 https://github.com/jobitjoseph/ESPWebFileManager
 https://github.com/playfultechnology/PN5180