add lib (#4728)

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

Author: GyverLibs

repositories.txt

@@ -2466,6 +2466,7 @@ https://github.com/gvandersel/SXAccessoire
 https://github.com/GypsyRobot/CuteBuzzerSounds
 https://github.com/GypsyRobot/Formulinha
 https://github.com/GypsyRobot/MusicBuzzer
+https://github.com/GyverLibs/Benchmark
 https://github.com/GyverLibs/GyverHTTP
 https://github.com/GyverLibs/GTL
 https://github.com/GyverLibs/EspSleep