add: portfolio is a dev sub domain

domains/_vercel.pmdnawaz1.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "pmdnawaz1",
+        "email": "pmdnawaz1@gmail.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=pmdnawaz1.is-a.dev,f7852b93a9e99f15a534"
+    }
+}

domains/pmdnawaz1.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "pmdnawaz1",
+        "email": "pmdnawaz1@gmail.com"
+    },
+    "records": {
+        "CNAME": "cname.vercel-dns.com"
+    }
+}