Added default config if config.yml is missing

Default config:
server:
  serverFolder: "factorio"
  worldFile: "factorio/saves/newworld.zip"
  serverSettings: "factorio/data/server-settings.json"
  serverExec: "factorio/bin/x64/factorio"
  port: 34197

factoryman:
  screen: True
  screenName: "Factorio"
  backupDir: "factorio/backups"
  username: ""
  apitoken: ""

structs.go

@@ -19,6 +19,24 @@ type UsrConfig struct {
 	} `yaml:"factoryman"`
 }
 
+type DefConfig struct {
+	Server struct { // server specific settings
+		ServDir   string
+		WorldFile string
+		ServCfg   string
+		ServExec  string
+		ServPort  int
+	}
+
+	Factoryman struct { // factoryman settings
+		BackupDir  string
+		UseScreen  bool
+		ScreenName string
+		UserName   string
+		ApiToken   string
+	}
+}
+
 // JSON file from config
 type Mod struct {
 	Name    string `json:"name"`