Doc: Readme fixes and update to v6.0.1

[avirtopeanu-ionos]

What does this fix or implement?

Currently there are some problems with the Readme.md file:

In the example code, import and all objects of type DataCenterApi need to be renamed to DataCentersApi

For pom.xml and gradle, versions need to have "v" pre-pended: example for pom.xml <version>6.0.0</version> into <version>v6.0.0</version>

Also, starting with v6.0.1, the method DataCentersApi::datacentersGet will need to have 3 more parameters: String orderBy, Integer maxResults, Map<String, String> filters. This needs to be reflected in the example code too

Checklist

• [x] PR name added as appropriate (e.g. feat/fix/doc/test/refactor/etc)
• [ ] Tests added or updated
• [x] Documentation updated
• [ ] Changelog updated and version incremented (label: upcoming release)
• [ ] Github Issue linked if any
• [x] Jira task updated

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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[avirtopeanu-ionos]

Sorry guys, used the old team for seeing who I needed to add as reviewers and added too many