Add typescript examples

[pedrodurek]

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included
• commit message and code follows the Developer's Certification of Origin

Checklist (for documentation change)

• only relevant documentation part is changed (make a diff before you submit the PR)
• motivation/reason is provided
• commit message and code follows the Developer's Certification of Origin

[pedrodurek]

I'll create more complex examples later

[coveralls]

Coverage remained the same at 95.862% when pulling e08590f on pedrodurek:add-typescript-example into b93be8e on i18next:master.