Add sgptools extension

Author: itskalvik

repos/itskalvik/sgptools/extension_logo.png

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+{
+    "name": "SGP-Tools",
+    "website": "https://www.itskalvik.com/sgp-tools/blueos.html",
+    "docker": "itskalvik/sgp-tools",
+    "description": "A BlueOS Extension for Autonomous Approximate Bathymetric Surveys"
+}