Add docs about contributing a blog post

This patch adds a brief description about contributing a new
blog post to the StarlingX website.

Change-Id: Ifec9958fa3d87bf6e29d4b1e6f0d6b107541eacc
Signed-off-by: Ildiko Vancsa <ildiko.vancsa@gmail.com>

doc/source/contributor/blog_contribute_guide.rst

@@ -0,0 +1,112 @@
+.. _blog_contribute_guide:
+
+===========================
+Blog Post Contributor Guide
+===========================
+
+This section describes the guidelines for contributing new blog posts to the
+StarlingX website.
+
+.. contents::
+   :local:
+   :depth: 1
+
+-------------------------------------------
+Share your stories on the StarlingX Website
+-------------------------------------------
+
+Are you experimenting with StarlingX or have it deployed in production and
+would like to share your story as a case study? Do you have an edge use case
+that StarlingX fits into, but the world doesn't know it yet? Do you have
+features in the platform that you like and would like to highlight? Do you have
+a StarlingX demo that you would like to draw attention to?
+
+Share your StarlingX story on the `StarlingX blog
+<https://www.starlingx.io/blog/>`_! You are only a few steps away...
+
+************************
+StarlingX website source
+************************
+
+Unlike the rest of the StarlingX artifacts, the StarlingX website code and
+content is stored in a `GitHub repository
+<https://github.com/StarlingXWeb/starlingx-website>`_.
+
+The blog posts are written using markdown language that is mainly plain text with a few
+easy formatting conventions to create lists, add images or code blocks, or
+format the text.
+
+You can find many `cheat sheets <https://www.markdownguide.org/cheat-sheet/>`_
+floating on the web to get in terms of the basic syntax. You can also check the
+`source files of the already existing blog posts
+<https://github.com/StarlingXWeb/starlingx-website/tree/master/src/pages/blog>`_
+, where you will find examples of all the basic items that you will
+need for your new entry.
+
+**********************
+Create a new blog post
+**********************
+
+When you create a new blog post, you need to create a new file in the
+`'src/pages/blog/' folder
+<https://github.com/StarlingXWeb/starlingx-website/tree/master/src/pages/blog>`_
+with a '.md' extension.
+
+Files are usually named 'starlingx-<the-title-of-your-blog-post>.md'.
+
+The markdown file has a few formatting conventions in its header to capture the
+title, author, publishing date and category of your blog post.
+
+The header looks like the following:
+
+::
+
+  ---
+  templateKey: blog-post
+  title: The Title of Your Amazing Blog Post
+  author: Your Name
+  date: 2021-01-28T16:23:52.741Z
+  category:
+    - label: News & Announcements
+      id: category-A7fnZYrE1
+  ---
+
+The categories give the possibility to filter on the web page and see only the
+blog posts that fall under one of the options. You can choose from the
+following options:
+
+* News & Announcements
+* Features & Updates
+
+The 'Annual Report' category is reserved for the StarlingX chapter in the
+Open Infrastructure Annual report that we are also re-posting on the StarlingX
+website.
+
+Blog posts usually start with a one-sentence overview and teaser that is
+formatted by using the '<!-- more -->' tag at the end of that line.
+
+Once you filled out the above fields in the header and got your one-liner all
+set, you can go ahead and type up the contents of your blog post using the
+conventional markdown formatting.
+
+If you have an image file to add, you need to place the file in the
+'static/img' folder.
+
+You can then insert the image into your blog post by using the following line:
+
+::
+
+  ![alt text](/img/the-file-name-of-your-image.jpg)
+
+Once you are done with formatting your blog post and happy with the content, you
+need to upload it to GitHub and create a pull request. You can do that by using
+git commands on your laptop or you can also use the GitHub web interface to add
+files to the repository and create a pull request when you are ready.
+
+If you have an idea for a blog post and would like to get feedback from the
+community about it, please send an email to the `starlingx-discuss mailing list
+<http://lists.starlingx.io/cgi-bin/mailman/listinfo/starlingx-discuss>`_.
+
+If you need help with either writing and formatting the content or uploading
+the final product to GitHub, please reach out to Ildiko Vancsa
+(ildiko@openinfra.dev) for help.

doc/source/contributor/index.rst

@@ -19,6 +19,7 @@ Contribute to documentation
    doc_contribute_guide
    api_contribute_guide
    release_note_contribute_guide
+   blog_contribute_guide
 
 ------------------
 Contribute to code