docs: update .all-contributorsrc [skip ci]

Author: allcontributors[bot]

.all-contributorsrc

@@ -6983,6 +6983,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "madhav2348",
+      "name": "Madhav Majumdar",
+      "avatar_url": "https://avatars.githubusercontent.com/u/161720210?v=4",
+      "profile": "https://github.com/madhav2348",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoType": "github",