docs: update README.md

Author: FishPlusOrange

README.md

@@ -1,10 +1,45 @@
 # GitHub Emoji
 
-A chrome extension of github emoji picker for fun :slightly_smiling_face: :octocat: :upside_down_face:.
+A chrome extension for the github emoji picker with fun :sunglasses:.
 
 ## Preview
 
-![github-emoji](https://github.com/FishPlusOrange/github-emoji/blob/master/docs/screenshot.png)
+![github-emoji](https://raw.githubusercontent.com/FishPlusOrange/github-emoji/master/docs/screenshot.png)
+
+## Install
+
+:point_right: Chrome Extension
+
+- [Let's get it]() :call_me_hand:
+
+:point_right: Manual Installation
+
+- Get "GitHub Emoji"
+
+  Clone with Git, or install with npm, or `yarn add` if you are using yarn as the package manager:
+
+  ```bash
+  # git
+  git clone https://github.com/FishPlusOrange/github-emoji.git
+  ```
+
+  ```bash
+  # npm
+  npm install @fishplusorange/github-emoji
+  ```
+
+  ```bash
+  # yarn
+  yarn add @fishplusorange/github-emoji
+  ```
+
+- Open "Chrome Extension" page
+
+- Check "Developer Mode"
+
+- Click "Load Unpacked Extension", and choose the folder `chrome`
+
+- Have fun :call_me_hand:
 
 ## License
 

chrome/manifest.json

@@ -2,7 +2,7 @@
   "name": "GitHub Emoji",
   "version": "1.1.0",
   "manifest_version": 2,
-  "description": "A chrome extension of github emoji picker for fun.",
+  "description": "A chrome extension for the github emoji picker with fun.",
   "homepage_url": "https://github.com/FishPlusOrange/github-emoji",
   "icons": {
     "16": "images/octocat.png",

docs/screenshot.png

@@ -3,7 +3,7 @@
   "version": "1.1.0",
   "author": "FishPlusOrange",
   "license": "MIT",
-  "description": "A chrome extension of github emoji picker for fun",
+  "description": "A chrome extension for the github emoji picker with fun",
   "scripts": {
     "dev": "webpack --mode-development --watch",
     "build": "webpack --mode-production",