refactor(create-app): detects pkgManager for run instructions (#1990)

Author: rschristian

packages/create-app/index.js

@@ -111,12 +111,14 @@ async function init() {
   pkg.name = path.basename(root)
   write('package.json', JSON.stringify(pkg, null, 2))
 
+  const pkgManager = /yarn/.test(process.env.npm_execpath) ? 'yarn' : 'npm'
+
   console.log(`\nDone. Now run:\n`)
   if (root !== cwd) {
     console.log(`  cd ${path.relative(cwd, root)}`)
   }
-  console.log(`  npm install (or \`yarn\`)`)
-  console.log(`  npm run dev (or \`yarn dev\`)`)
+  console.log(`  ${pkgManager === 'yarn' ? `yarn` : `npm install`}`)
+  console.log(`  ${pkgManager === 'yarn' ? `yarn dev` : `npm run dev`}`)
   console.log()
 }