Improve release Notes

[VojtechBartoska]

Add description to release notes including Breaking changes and explanation of all changes.

[VojtechBartoska]

Moving this Task under 2.0.1 release.

In 2.0.0 release summary of main changes was written.

In 2.0.1 release more specific Release Notes will be written.

[VojtechBartoska]

Closing this issue, release notes already improved and we will keep improving it in future releases. Thanks @pedrominatel.