Update README

README.md

@@ -44,7 +44,7 @@ The default sounds of notifications is provided [Creative Commons BY](https://cr
 
 Crowdin project is available! Visit: https://translate.thedesk.top
 
-## Requirement
+## Requirement and development
 
 * Electron 4.2 or above(install yourself)
 * electron-dl(in package.json)
@@ -57,6 +57,10 @@ Crowdin project is available! Visit: https://translate.thedesk.top
 * sumchecker(in package.json)
 * Ability to read unformated files!(install yourself)
 
+### Run on developer mode
+
+`npm run dev` on `app` folder.
+
 ## Contributors
 
 Build for macOS  

README_ja.md

@@ -57,6 +57,10 @@ Crowdinから翻訳に参加してみませんか？: https://translate.thedesk.
 * sumchecker(in package.json)
 * Ability to read unformated files!(自分で入れて)
 
+### デベロッパーモード
+
+`npm run dev`を`app`フォルダ内で実行
+
 ## 主なコントリビューター
 
 macOSビルダー