Adding library (#5358)

* Adding SerialLogger

* Adding ultiblox libraries

* Adding newline

* Adding libraries

* Adding DisplayValueNull library

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Co-authored-by: Maker Zone <[email protected]>

Author: maker-zone

repositories.txt

@@ -7476,6 +7476,7 @@ https://github.com/UltiBlox/ActiveThreshold
 https://github.com/UltiBlox/DisplayValueLCD
 https://github.com/UltiBlox/DisplayValueCommon
 https://github.com/UltiBlox/UltiBloxExamples
+https://github.com/UltiBlox/DisplayValueNull.git
 https://github.com/mirs240x/micro_ros_arduino_mirs240x
 https://github.com/SequentMicrosystems/Sequent-16relays-Library
 https://github.com/canusorn/CynoIOT