Add mani.is-a.dev subdomain for my portfolio

domains/mani.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "repo": "https://github.com/mani-prakash-reddy/portfolio_mine",
+    "email": "maniprakashreddy223230@gmail.com"
+  },
+  "record": {
+    "cname": "mani-prakash-reddy.github.io"
+  }
+}