Add backsoftdev.json for domain configuration

domains/backsoftdev.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "BackSoftDEV",
+    "email": "nguyendinhbach99@gmail.com"
+  },
+  "record": {
+    "CNAME": "BackSoftDEV.github.io"
+  }
+}