Create vanmanh.json

## Requirements
Unless explicitly specified otherwise by a ** maintainer ** or in the requirement description, your domain must pass ** ALL ** the
indicated requirements above.

Please note that we reserve the rights not to accept any domain at our own discretion.

- [x] The file is in the 'domains' folder and is in the JSON format.
- [x] The file's name is all lowercased and alphanumeric. <!-- Your file's name is yourname.json, not YourName.json or
your_name.json. -- >
- [x] You have completed your website. <!-- This is not required if the domain you're registering is for emails. -- >
- [x] The website is reachable. <!-- This is not required if the domain you're registering is for emails. -- >
- [x] You're not using Vercel. <!-- This is not required if you're using an URL record. -- >
- [x] The CNAME record doesn't contain 'https:// or '/. <!-- This is not required if you are not using a CNAME record. -- >
- [x] There is sufficient information at the 'owner' field. <!-- You need to have your email presented at 'email' field. If you don't
want to provide your email for any reason, you can specify another social platform (e.g. Twitter) so we can contact you. -- >

domains/vanmanh.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "vanmanhdev",
+        "email": "vanmanh2763@gmail.address"
+    },
+    "record": {
+        "CNAME": "vanmanhdev.github.io"
+    }
+}