Add some docs for projects.

README.md

@@ -71,8 +71,26 @@ For full blog posts, use this format:
 
 And concoct a page title for your post. The body of the post goes after the `---` in either case.
 
+You can also customize the icon that is displayed on the news feed. By default it's `newspaper-o`. We use icons from the [FontAwesome][fa] icon set.
+
 [yfm]: http://jekyllrb.com/docs/frontmatter/
+[fa]: http://fontawesome.io/icons/
+
+Projects
+--------
 
+To create a project, just create a markdown file in the `_projects` folder. Here are the things you can put in the YAML frontmatter:
+
+- `title:` The project title.
+- `notitle:` Set this to `true` if you don't want a title displayed on the project card. Optional.
+- `description:` The text shown in the project card. It supports markdown.
+- `people:` The people working on the project. This is a list of keys from the `_data/people.yml` file.
+- `layout: project` This sets the layout of the actual project page. It should be set to `project`.
+- `image:` The URL of an image for the project. This is shown on both the project page and the project card. Optional.
+- `last-updated:` Date in the format of `YYYY-MM-DD`. The project cards are sorted by this, most recent first.
+- `status: inactive` Set this to `inactive` if don't want the project to appear on the front page. Just ignore it otherwise.
+- `link:` Set this to an external URL if this project has a page somewhere else on the web. If you don't have a `link:`, then the content of this markdown file (below the YAML frontmatter) will be this project's page.
+- `no-link: true` Set this if you just don't want a project page for your project.
 
 Personnel
 ---------