chore(docs): Improve readme samples

[dmihalcik-virtru]

• Uses newer 'options object' constructor parameter
• Be more clear about what the auth providers are and how to select one, or write your own

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud