Add rahul21.json for domain configuration

domains/rahul21.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "Rahulshah21",
+    "email": "rahulshah123shah@gmail.com"
+  },
+    "records": {
+        "CNAME": "rahulshah21.github.io"
+    }
+}