Added supporter

docs/network.md

@@ -102,4 +102,5 @@ This is a list of companies providing network hardware and connectivity services
 | ![Logo of ediscom](img/supporters/ediscom.png)       | <https://www.ediscom.de/> | Wavelength |
 | ![Logo of eventinfra](img/supporters/eventinfra.png)  | <https://eventinfra.org/> | Network equipment loan |
 | ![Logo of flexoptix](img/supporters/flexoptix.png) | <https://www.flexoptix.net/> | Network equipment loan |
+| ![Logo of i3d](img/supporters/i3d.png) | <https://www.i3d.net/> | Network equipment loan |