feat: add schematics to the library (ng add @angular-material-extensions/jumbotron)

### Bug Report or Feature Request (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- [x] feature request
```


### Desired functionality
the developer should be able to add the library via schematics

```sh
ng add @angular-material-extensions/jumbotron
```

and everything should be already setup e.g: add import statement of the lib to `app.module.ts`