Add layout icon

CHANGELOG.md

@@ -85,6 +85,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   - `folder`
   - `heart`
   - `inbox`
+  - `layout`
   - `lock`
   - `mail`
   - `minus`

icons-manifest.json

@@ -60,6 +60,7 @@
   "music",
   "radio",
   "headphones",
+  "layout",
   "star",
   "award",
   "umbrella",

icons/layout.svg

+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <rect x="3" y="3" width="18" height="18" rx="2" ry="2"/>
+  <line x1="3" y1="9" x2="21" y2="9"/>
+  <line x1="9" y1="21" x2="9" y2="9"/>
+</svg>
\ No newline at end of file