Add transition planning tool

[swarmidentity]

This is an experimental/beta tool I'm using for my own transition planning, hopefully other people find it useful!

[aytvill]

@swarmidentity do I need to deploy to public web the version with your addition? or running it on localhost is enough? usually it's limited to https-only limitations

[swarmidentity]

@aytvill I found this code useful for my own transition planning anxiety when I was starting the process, but it wasn't quite worth setting up/promoting as a standalone website. It would be cool to make public so other people can try it out, if there's feedback from the community I can improve the tool.

For the HTTPS limit are you referring to this import? If so I can save "style.css" into the project and just import it directly.
<link type="text/css" href="http://mbostock.github.io/d3/style.css" rel="stylesheet" />