feat(icons): added layers-plus icon (#3367)

* Added icons/layers-plus.svg

* Added icons/layers-plus.json

* Update layers-plus.json

fix: updated contributors to reflect actual author

* fix(icon): update layers-plus icon to follow size and spacing guidelines

* fix(icon): adjust layers-plus plus sign alignment and slope

* fix(icon): apply optimized version from reviewer to align on grid and spacing

* chore: add karsa-mistmere as contributor

---------

Co-authored-by: Eric Fennis <eric.fennis@gmail.com>

icons/layers-plus.json

@@ -0,0 +1,22 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "juanisidoro",
+    "karsa-mistmere"
+  ],
+  "tags": [
+    "stack",
+    "layers",
+    "add",
+    "new",
+    "increase",
+    "create",
+    "positive",
+    "copy",
+    "upgrade"
+  ],
+  "categories": [
+    "design",
+    "layout"
+  ]
+}

icons/layers-plus.svg

@@ -0,0 +1,17 @@
+<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"
+>
+  <path d="M12.83 2.18a2 2 0 0 0-1.66 0L2.6 6.08a1 1 0 0 0 0 1.83l8.58 3.91a2 2 0 0 0 .83.18 2 2 0 0 0 .83-.18l8.58-3.9a1 1 0 0 0 0-1.831z" />
+  <path d="M16 17h6" />
+  <path d="M19 14v6" />
+  <path d="M2 12a1 1 0 0 0 .58.91l8.6 3.91a2 2 0 0 0 .825.178" />
+  <path d="M2 17a1 1 0 0 0 .58.91l8.6 3.91a2 2 0 0 0 1.65 0l2.116-.962" />
+</svg>