[readme] [l]: add readme and screencast

packages/create-portal-app/README.md

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+# Create Portal App
+
+<br/>
+
+<img src="resources/create-portal-app.gif">
+
+<br/>
+<br/>
+
+This is a friendly way to start using  `portal.js`. Using this CLI helps you to set up fast and easly one portal.js with the default template.
+The CLI automatically create the project folder, install main dependencies, generate a new git repository and change package name.
+
+<br/> 
+
+## How to use
+
+To create a new portal.js application you can send the project name as first argument.
+```
+create-portal-app my-app
+```
+
+<br/>
+
+## Options
+`create-portal-app` comes with options:
+
+- **--use-npm** - This option allows to use npm instead yarn as default package manager
+
+