Add blog.siddharth.json configuration file

I hope this configuration is correct.

domains/blog.siddharth.json

@@ -0,0 +1,12 @@
+{
+  "owner": {
+    "username": "siddharthjain25",
+    "email": "siddharthjainj25@gmail.com",
+    "discord": "804397662467915777"
+  },
+  "records": {
+    "CNAME": "cd42b31dd97e809d.vercel-dns-017.com",
+    "TXT": "vc-domain-verify=blog.siddharth.is-a.dev,10b4f6d9358d4668cfe3"
+  },
+  "proxied": true
+}