Create documentation/readme template info for PM's to make sure project info populates to card component from repos

[zenlex]

We need to create a markdown template file with frontmatter fields that match all the needed data on the project cards field. This will serve as the template for all Organization readmes going forward. Will accept PRs for each task (be sure to check for existing branch). **Frontmatter should also contain a content-type: project field and a publish: true|false

• create blank PROJECT_README_TEMPLATE.md with the frontmatter fields needed for project card data. See Create Project Card component #76
• Look at Courtbot sample md files and add default headings and any other common styling/structure that makes sense for a typical civic tech project (look at other code for tulsa repos or other code for america projects for examples. Feel free to steal from this repo's readme as a starting point also).

[vivian-tse]

I can work on this.