Add Sequent Microsystems Sixteen relays card library (#5352)

Author: alexburcea2877

repositories.txt

@@ -7476,3 +7476,4 @@ https://github.com/UltiBlox/DisplayValueLCD
 https://github.com/UltiBlox/DisplayValueCommon
 https://github.com/UltiBlox/UltiBloxExamples
 https://github.com/mirs240x/micro_ros_arduino_mirs240x
+https://github.com/SequentMicrosystems/Sequent-16relays-Library