Add device-dashboard

tutorials/device-dashboard/full-dashboard/web_root/logo.svg

@@ -0,0 +1,23 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600" width="1200" height="600">
+  <defs>
+    <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#2dd4bf"/>
+      <stop offset="100%" stop-color="#0f766e"/>
+    </linearGradient>
+  </defs>
+
+  <!-- icon: two rounded rectangles -->
+  <g fill="none" stroke="url(#g)" stroke-width="40" stroke-linecap="round" stroke-linejoin="round">
+    <rect x="140" y="160" width="260" height="260" rx="70"/>
+    <rect x="260" y="80" width="260" height="260" rx="70"/>
+  </g>
+
+  <!-- text -->
+  <text x="560" y="330"
+        font-family="system-ui, -apple-system, Segoe UI, Roboto, sans-serif"
+        font-size="160"
+        font-weight="600"
+        fill="#6b7280">
+    my logo
+  </text>
+</svg>