Add JSON configuration for GitHub Pages

JSON configuration to verify my is-a.dev subdomain with GitHub Pages.

domains/_github-pages-challenge-hrittm.hrittick.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "hrittm",
+        "email": "thathrimondal@gmail.com"
+    },
+    "records": {
+        "TXT": "6e8e1758095006c16c84058c745cba"
+    }
+}