[UpdateTool - Project Information] Add support level badge.

[kporras07]

This Pull Request sets a support level badge for this project. This badge will be used to sort all of Pantheon open source projects among these categories:

• Early Access
• Limited Availability
• Actively Maintained
• Minimal Support
• Unsupported
• Unofficial
• Deprecated

You can find more information about these levels by visiting the Support Levels documentation.

This project appears to be unsupported; this PR will therefore be automatically merged if no one comments on it in the next thirty days. If this project is being maintained, please review this PR and adjust the support level accordingly and merge it so that the badge gets displayed in the project page in Github.

If you have any questions, feel free to reach out to #cms-ecosystem in Slack with a link to this Pull Request.

[kporras07]

Oops! I was testing. Sorry about that