feat(icons): added square-square icon (#2241)

* Added icons/square-square.svg

* Added icons/square-square.json

icons/square-square.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "colebemis",
+    "ericfennis",
+    "jguddas"
+  ],
+  "tags": [
+    "float",
+    "center",
+    "rectangle"
+  ],
+  "categories": [
+    "layout"
+  ]
+}

icons/square-square.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 x="3" y="3" width="18" height="18" rx="2" />
+  <rect x="8" y="8" width="8" height="8" rx="1" />
+</svg>