add shadcn icon with original SVG and update devicon.json

Author: Yashh56

devicon.json

@@ -11772,6 +11772,27 @@
         "color": "#3b4b72",
         "aliases": []
     },
+    {
+        "name": "shadcn",
+        "altnames": [],
+        "tags": [
+            "ui",
+            "components",
+            "reactjs",
+            "library"
+        ],
+        "versions": {
+            "svg": [
+                "original"
+            ],
+            "font": [
+                "original",
+                "plain"
+            ]
+        },
+        "color": "#000000",
+        "aliases": []
+    },
     {
         "name": "shopware",
         "altnames": [],