APDS9900 sensor (#5728)

* Update repositories.txt

Add rotaryDecoder8, an Arduino library for a PCF8575 based rotary decoder - supports 8 rotary encoders.

* Update repositories.txt

Add Arduino library for the I2C APDS9900 light sensor and proximity detector.

Author: RobTillaart

repositories.txt

@@ -5346,6 +5346,7 @@ https://github.com/RobTillaart/AnalogUVSensor
 https://github.com/RobTillaart/Angle
 https://github.com/RobTillaart/AngleConvertor
 https://github.com/RobTillaart/ANSI
+https://github.com/RobTillaart/APDS9900
 https://github.com/RobTillaart/AS5600
 https://github.com/RobTillaart/AsyncAnalog
 https://github.com/RobTillaart/AtomicWeight