docs: change with npm publish

Author: dekimasoon

README.md

@@ -14,9 +14,11 @@ Under development. Check out TODO what is not implemented yet.
 Please see [start guide](https://github.com/dekimasoon/vue-cli-plugin-cordova/blob/master/docs/StartGuide.md).
 
 ```sh
-$ npm i dekimasoon/vue-cli-plugin-cordova  # publish to npm soon
-$ vue invoke vue-cli-plugin-cordova
-$ npm run cordova-serve
+$ vue add cordova
+
+# in another tab
+$ cordova prepare
+$ open http://localhost:8080
 ```
 
 ## If hot reloading not working

docs/StartGuide.md

@@ -4,8 +4,7 @@
 $ npm i @vue/cli -g
 $ vue create my-project    
 $ cd my-project 
-$ npm i dekimasoon/vue-cli-plugin-cordova  # publish to npm soon
-$ vue invoke vue-cli-plugin-cordova
+$ vue add cordova
 ```
 
 And you need to [set up the cordova development environment](https://cordova.apache.org/docs/en/latest/guide/cli/index.html).