Started work on adding mod downloader

Read from mod-list.json in mod dir and download each mod in list.
This requires reading from factorio mod portal api, and extracting download url and calling it with username and api token.

new field in config.yml username and apitoken, is needed to download mod files from mod.factorio.com

config.go

@@ -9,8 +9,6 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
-const fmConfig = "config.yml"
-
 type GoConfig struct {
 	Server struct { // server specific settings
 		ServDir   string `yaml:"serverFolder"`
@@ -24,6 +22,8 @@ type GoConfig struct {
 		BackupDir  string `yaml:"backupDir"`
 		UseScreen  bool   `yaml:"screen"`
 		ScreenName string `yaml:"screenName"`
+		UserName   string `yaml:"username"`
+		ApiToken   string `yaml:"apitoken"`
 	} `yaml:"factoryman"`
 }