add configurable port

config.go

 		Pass   string `json:Pass`
 		Schema string `json:Schema`
 	} `json:DB`
+	Server struct {
+		Host string `json:Host`
+		Port string `json:Port`
+	} `json:Server`
 }
 
 var Config AppConfig

config.json

           "User": "sp",
           "Pass": "sp",
           "Schema": "leanwork_pay"
+     },
+     "Server": {
+          "Host":"localhost",
+          "Port":"8080"
      }
 }

config.test.json

         "User": "sp",
         "Pass": "sp",
         "Schema": "leanwork_pay"
-    }
+    },
+    "Server": {
+        "Host":"localhost",
+        "Port":"8080"
+   }
 }