Add default viper configuration

defaults.go

@@ -0,0 +1,11 @@
+package main
+
+import "github.com/spf13/viper"
+
+func setDefaults() {
+
+	viper.SetDefault("Processes", 1)
+	viper.SetDefault("RawDir", "raw")
+	viper.SetDefault("Solvers", map[string]interface{}{})
+
+}

main.go

@@ -26,6 +26,8 @@ func initConfig() {
 		viper.SetConfigFile(cfgFile)
 	}
 
+	setDefaults()
+
 	viper.SetConfigName("config")                   // name of config file (without extension)
 	viper.AddConfigPath("$HOME/.config/chronozinc") // add home directory as first search path
 	viper.AddConfigPath(".")                        // add current directory as an alternative