Added new contribution (#1937)

Co-authored-by: Vladislav Loktev <belliavesha@gmail.com>
Co-authored-by: Kathy <65121394+kfahn22@users.noreply.github.com>

Author: 3 people

content/videos/challenges/c2-collatz-conjecture/showcase/contribution-1765757484.json

@@ -0,0 +1,10 @@
+{
+  "title": "Collatz Tree Explorer",
+  "author": {
+    "name": "Vladislav Loktev",
+    "url": "https://belliavesha.github.io"
+  },
+  "url": "https://belliavesha.github.io/collatztree/",
+  "submittedOn": "2025-12-15T00:11:25.007Z",
+  "socialPermission": true
+}