implement config file

config/config.go

@@ -0,0 +1,25 @@
+package config
+
+import (
+	"log"
+
+	"github.com/tkanos/gonfig"
+)
+
+type Configuration struct {
+	DB_HOST     string
+	DB_PORT     string
+	DB_USER     string
+	DB_PASSWORD string
+	DB_NAME     string
+	JWT_SECRET  string
+}
+
+func GetConfig() Configuration {
+	configuration := Configuration{}
+	err := gonfig.GetConf("config/config.json", &configuration)
+	if err != nil {
+		log.Fatalf("Failed to load configuration file, error: %v", err)
+	}
+	return configuration
+}

config/config.json

@@ -0,0 +1,8 @@
+{
+    "DB_HOST":"localhost",
+    "DB_PORT":"5432",
+    "DB_USER":"graphql",
+    "DB_PASSWORD":"graphql",
+    "DB_NAME":"graphql",
+    "JWT_SECRET":"cadoles"
+}