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extension/README.md

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+# Chrome Extension TypeScript Starter
+
+![build](https://github.com/chibat/chrome-extension-typescript-starter/workflows/build/badge.svg)
+
+Chrome Extension, TypeScript and Visual Studio Code
+
+## Prerequisites
+
+* [node + npm](https://nodejs.org/) (Current Version)
+
+## Option
+
+* [Visual Studio Code](https://code.visualstudio.com/)
+
+## Includes the following
+
+* TypeScript
+* Webpack
+* React
+* Jest
+* Example Code
+    * Chrome Storage
+    * Options Version 2
+    * content script
+    * count up badge number
+    * background
+
+## Project Structure
+
+* src/typescript: TypeScript source files
+* src/assets: static files
+* dist: Chrome Extension directory
+* dist/js: Generated JavaScript files
+
+## Setup
+
+```
+npm install
+```
+
+## Import as Visual Studio Code project
+
+...
+
+## Build
+
+```
+npm run build
+```
+
+## Build in watch mode
+
+### terminal
+
+```
+npm run watch
+```
+
+### Visual Studio Code
+
+Run watch mode.
+
+type `Ctrl + Shift + B`
+
+## Load extension to chrome
+
+Load `dist` directory
+
+## Test
+`npx jest` or `npm run test`