Add [aspect] ratio icon

icons/ratio.json

@@ -0,0 +1,26 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "danielbayley"
+  ],
+  "tags": [
+    "screens",
+    "aspect ratio",
+    "proportions",
+    "16:9",
+    "widescreen",
+    "4:3",
+    "responsive",
+    "mobile",
+    "desktop",
+    "monitor",
+    "portrait",
+    "landscape"
+  ],
+  "categories": [
+    "connectivity",
+    "devices",
+    "design",
+    "photography"
+  ]
+}

icons/ratio.svg

@@ -0,0 +1,14 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <rect width="12" height="20" x="6" y="2" rx="2" />
+  <rect width="20" height="12" x="2" y="6" rx="2" />
+</svg>