base image + skeleton for loading config file

config.go

@@ -1,8 +1,30 @@
 package main
 
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
 type Config struct {
-	Method string 
-	OutputDir string
+	Method    string `json:method`
+	OutputDir string `json:outputdir`
+	BaseImage string `json:baseimage`
 }
 
+// loads configuration values from json file
+func (c *Config) LoadConfigFromFile(filePath string) {
+	file, _ := os.Open("conf.json")
+	defer file.Close()
+	decoder := json.NewDecoder(file)
+	configuration := Config{}
+	err := decoder.Decode(&configuration)
+	if err != nil {
+		fmt.Println("error:", err)
+	}
+	fmt.Println(configuration.Method)
+	fmt.Println(configuration.OutputDir)
+}
+
+// global register to acccess configuration values
 var ConfigRegister Config