Update repositories.txt (#6692)

Author: montoyamoraga

repositories.txt

@@ -5091,6 +5091,7 @@ https://github.com/pilotak/MovingAverage
 https://github.com/pilotak/MovingAverageAngle
 https://github.com/pilotak/MovingAverageFloat
 https://github.com/pilotak/WeatherMeters
+https://github.com/piruetasxyz/FrecuenciasMIDI
 https://github.com/piruetasxyz/NotasMIDI
 https://github.com/piruetasxyz/maqui_library
 https://github.com/piruetasxyz/Pantalla12x8