pack: add .editorconfig and use tab instead of space

src/renderer/locales/en.json

@@ -1,10 +1,10 @@
 {
-  "desc": {
-    "welcome": "Thank you for using Vutron. This cool template makes it easy to create a variety of cross-platform applications."
-  },
-  "menu": {
-    "change-theme": "Change Theme",
-    "change-language": "Change Language",
-    "about": "About Vutron"
-  }
+	"desc": {
+		"welcome": "Thank you for using Vutron. This cool template makes it easy to create a variety of cross-platform applications."
+	},
+	"menu": {
+		"change-theme": "Change Theme",
+		"change-language": "Change Language",
+		"about": "About Vutron"
+	}
 }