Create _github-pages-challenge-luongductrong.ldt.json

Create a _github-pages-challenge-luongductrong.ldt.json record to verify ownership of the previously registered domain name ldt.is-a.dev

domains/_github-pages-challenge-luongductrong.ldt.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "luongductrong",
+    "email": "luongductrong2004@gmail.com"
+  },
+  "records": {
+    "TXT": "090573f418b0850fb3938e6deca33e"
+  }
+}