message: Add getting started info
diff: # shiftjs
  +
  +Shiftjs works best with a new Create-React-App project:
  +
  +```shell
  +$ npx create-react-app my-new-app
  +$ cd my-new-app
  +```
  +
  +From here to help installing Shift.js you can use the install_script.sh script found in the repository.
  +
  +```shell
  +$ ../path/to/shiftjs/install_script.sh
  +```
  +
  +From now you can begin using Shift.js by launching
  +
  +```shell
  +$ npm start
  +```
  +
  +For using backend functions inside a frontend file you need to import the Shift macro first like this.
  +
  +```javascript
  +import '@binaris/shift-babel-macro/macro';
  +```
  +
  +You can create a backend file in the backend directory, for example `backend/HelloBackend.js`
  +
  +```javascript
  +// @expose
  +export async function hello(name) {
  + return 'hello ' + name;
  +}
  +```
  +
  +You can call get a reference to this function by importing it from a front-end code like
  +
  +```javascript
  +import { hello } from '../backend/HelloBackend';
  +```
  +
  +Now you can call the function as usual by using:
  +
  +```javascript
  +hello('World');
  +```
  +
  +The `@binaris/shift-db` package was installed, you can require it in backend code like:
  +
  +```javascript
  +import { create } from '@binaris/shift-db';
  +```
  