Create infrastructure to accept pledges

[vsoch]

The interested user should be able to request a review (via submission of an online form) or via pull request to the repository. Given the form, one of the maintainers will open the PR for discussion. Specifically:

• The submitter should add some file with metadata that will be served (@pdurbin thoughts?)
• The entry will be reviewed in the PR if the criteria are met
• Merging will generate the badge for the project/community, along with updating Github pages site for those that have taken the pledge.

So I need to figure out that flow of things.

[vsoch]

This is done much more simply with a link that opens up in edit view. The page is now live - it reads in a csv directly from the repo (pledge.csv), renders it into a table on the page, and the viewer can click a button to edit that exact file.