Update readme content roles description

[Komodoro]

A much more informative way to describe the roles. This description is available inline of the html while hovering the respective role attribute.

This is not an urgent call but it seems that it is missing from the documentation. I felt an urge to help others by making this available. Using this plugin on a daily basis, and having this properly documented in the README file of the project, the respective table can provide assistance to others understand better what they are selecting instead of just hovering over the values in the small text box that the plugin has. Since hovering details only show info for a little nick of time this is a much more a intuitive approach, as well as it help define strategies to apply this Probably not a best practice since there could be a lot of places to have this table on, but at least it will help some folks who want to have this documented somehow.

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• [ ] Ensure that the pull request title represents the desired changelog entry
• [x] Please describe what you did
• [ ] Link to relevant issues in GitHub or Jira
• [ ] Link to relevant pull requests, esp. upstream and downstream changes
• [ ] Ensure you have provided tests - that demonstrates feature works or fixes the issue

[Komodoro]

@AbhyudayaSharma maybe this should be in the docs folder. Let me know if this makes more sense.

[AbhyudayaSharma]

Also, please ignore the failing build. This is a problem with ci.jenkins.io, not with the pull request.

[Komodoro]

Sorry... Had some time off from work and I have this on my work PC. Your plugin is saving a lot of people. I'll update ASAP.