Add radical icon (square root) (#1847)

* Add `square-root`icon

* Update square-root.svg

* Fix square icon SVG

Co-authored-by: Jakob Guddas <github@jguddas.de>

* Rename `square-root` `radical`

* Rename radical-square.json to square-radical.json

* Rename radical-square.svg to square-radical.svg

* Update radical.json

* Match activity height

Co-authored-by: Karsa <contact@karsa.org>

---------

Co-authored-by: Jakob Guddas <github@jguddas.de>
Co-authored-by: Eric Fennis <eric.fennis@gmail.com>
Co-authored-by: Karsa <contact@karsa.org>

icons/radical.json

@@ -0,0 +1,19 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "smnandre"
+  ],
+  "tags": [
+    "calculate",
+    "formula",
+    "maths",
+    "operator",
+    "root",
+    "square",
+    "symbol"
+  ],
+  "categories": [
+    "development",
+    "maths"
+  ]
+}

icons/radical.svg

@@ -0,0 +1,13 @@
+<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="M3 12h4l3 9 4-17h7" />
+</svg>

icons/square-radical.json

@@ -0,0 +1,20 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "smnandre"
+  ],
+  "tags": [
+    "calculate",
+    "formula",
+    "maths",
+    "operator",
+    "root",
+    "square",
+    "symbol"
+  ],
+  "categories": [
+    "development",
+    "maths",
+    "shapes"
+  ]
+}

icons/square-radical.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"
+>
+  <path d="M7 12h2l2 5 2-10h4" />
+  <rect x="3" y="3" width="18" height="18" rx="2" />
+</svg>