Revert "remove unused"

This reverts commit 3fa6002.

Author: lxieyang

README.md

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+# Screenshot Browser Extension
+
+Based on [Chrome Extension Boilerplate with React 17 and Webpack 5](https://github.com/lxieyang/chrome-extension-boilerplate-react)
+
+## To install
+
+### From Chrome store
+
+_Currently under review_
+
+### From Github Releases
+
+1. Download the latest `build.zip` from the [Release](https://github.com/lxieyang/screenshot-extension/releases) page. Or click [here](https://github.com/lxieyang/screenshot-extension/releases/download/v0.0.1/build.zip).
+2. Unzip
+3. Go to `chrome://extensions/` (or `edge://extensions/` if you're using MS Edge) and enable `Developer mode`.
+4. Click `Load Unpacked`, then select the unzipped folder (which contains a file called `manifest.json`).
+
+### Build from the source
+
+1. Clone this git repo
+2. Run `npm install`.
+3. Run `npm run build`, which will generate a `build` folder.
+4. Go to `chrome://extensions/` (or `edge://extensions/` if you're using MS Edge) and enable `Developer mode`.
+5. Click `Load Unpacked`, then select the `build` folder (which contains a file called `manifest.json`).
+
+## To use
+
+- Hold the `Option/Alt` key and drag the mouse to create partial screenshots.
+- Click the extension icon to create full-page screenshots.
+
+---
+
+Michael Xieyang Liu | [Website](https://lxieyang.github.io)