Update repositories.txt (#6614)

Adrelien · web-flow · commit 4d75cce12f38 · 2025-07-17T10:24:00.000Z
diff --git a/repositories.txt b/repositories.txt
@@ -8230,3 +8230,4 @@ https://github.com/npuckett/WebGUI
 https://github.com/kolod/Arduino-Simple-Modbus-Slave
 https://github.com/EmotiBit/EmotiBit_DSPFilters
 https://github.com/EmotiBit/BrainflowSpO2Algorithm
+https://github.com/TelemetryHarbor/harbor-sdk-c-plus-plus
