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

[AnthonyNahas]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Versions

lib version -> 1.1.1

Desired functionality

the developer should be able to add the library via schematics

ng add @angular-material-extensions/link-preview

and everything should be already setup e.g: add import statement of the lib to app.module.ts