Add usage and update description

Author: PeachScript

README.md

@@ -1,5 +1,22 @@
 # Generator-abstack-vuejs
-A yeoman generator for Vue.js
+A yeoman generator for Vue.js.
+
+## Usage
+You must install the [yeoman](https://github.com/yeoman/yeoman) first:
+
+```bash
+npm install -g yo
+```
+
+Then:
+
+```bash
+# install
+npm install -g generator-abstack-vuejs
+
+# generate project
+yo abstack-vuejs
+```
 
 ## Changelog
 Visit [release notes](https://github.com/PeachScript/generator-abstack-vuejs/releases)

package.json

@@ -1,7 +1,7 @@
 {
   "name": "generator-abstack-vuejs",
   "version": "0.2.1",
-  "description": "A yeoman generate with Vue.js",
+  "description": "A yeoman generator for Vue.js",
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"