Update ReadMe/Contributing docs to include instructions for adding blog posts

[theecrit]

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• Bug (something's broken)
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Description

Update ReadMe/Contributing docs to include instructions for adding blog posts:

• Include details about front matter requirements like post-excerpt and author
• Include instructions for blog header images (front matter, alt text, etc)
• What to include in post footer for Voices series
• General editorial guidance
• Instructions for waiting 36 hours to merge minor changes after requesting review and 72 hours for major changes.

Related: #183

Thank you!

[theecrit]

Cheat sheet for configuring includes:

You'll need to create three files:

• MD file: the markdown file gets converted to your web page and holds the include (stored in the src folder)
• HTML file: the html file is the include that formats how the data will appear once embedded in your markdown file (stored in the src/_includes folder)
• YAML file: the data to be pulled into the include (stored in the src/_data folder)

In the YAML file:

• List your data instantiations here.
• Syntax and spaces matter! Your best best is to copy and paste an existing YAML file in the _data folder, and replace the variables you'd like to use.

In the HTML include file:

• This contains the HTML code for how you want the data instantiations to display in the UI. Use Jekyll syntax to call the data variables you want to display.

In the markdown file:

• Add your include where you want it to appear: {%- for include-name in site.data.includeYAMLfileName -%}. This pulls in the HTML _include file and populates it with with data instantiations from the YAML file.