implement basic localdb function

utils.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+)
+
+func GetLocaldb(dbPath string) map[string]User {
+	users := map[string]User{}
+	content, err := os.ReadFile(dbPath)
+	if err != nil {
+		log.Fatal("Error when opening file: ", err)
+	}
+	err = json.Unmarshal(content, &users)
+	if err != nil {
+		log.Fatal("Error during Unmarshal(): ", err)
+	}
+	return users
+}