fix: validate project name

ISSUE: #1024
Add validate-npm-package-name.

Author: hiroppy

packages/@vue/cli/lib/create.js

@@ -6,12 +6,18 @@ const inquirer = require('inquirer')
 const Creator = require('./Creator')
 const clearConsole = require('./util/clearConsole')
 const { error, stopSpinner } = require('@vue/cli-shared-utils')
+const validateProjectName = require('validate-npm-package-name')
 
 async function create (projectName, options) {
   const inCurrent = projectName === '.'
   const name = inCurrent ? path.relative('../', process.cwd()) : projectName
   const targetDir = path.resolve(projectName || '.')
 
+  if (!validateProjectName(projectName).validForNewPackages) {
+    console.error(chalk.red(`Could not be created because ${projectName} is an invalid name.`))
+    process.exit(1)
+  }
+
   if (fs.existsSync(targetDir)) {
     if (options.force) {
       rimraf.sync(targetDir)

packages/@vue/cli/package.json

@@ -51,6 +51,7 @@
     "rimraf": "^2.6.2",
     "semver": "^5.4.1",
     "slash": "^1.0.0",
+    "validate-npm-package-name": "^3.0.0",
     "yaml-front-matter": "^3.4.1"
   },
   "engines": {