Create README.md

Author: gigapod

README.md

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+# sparkfun.github.io
+
+This repo creates the GitHub pages custom domain `docs.sparkfun.com` and landing page that lists out all SparkFun GitHub product repos that have github pages documentation.
+
+The list of available pages is created automatically by a GitHub Action that runs nightly. This GitHub actions searches for repos under the spakfun organization that have the topic `sparkfun-tutorial`.
+
+For a repo to be added to the list of documents, the following should be true in the About section of the repo:
+
+* The repo has the topic `sparkfun-tutorial`
+* The `website` section for the repo points to the GitHub Pages URL for that repo (check the provided option when editing the about page).
+* The value of the description is provided
+
+### How this works
+
+* Daily, or on a check in, the update action runs
+* The Action using thg `gh` command to search for all public sparkfun respositories that have the topic `sparkfun-tutorial`
+* For each repositoriy found, the repo URL, About website and About description are retrieved
+* The results of the query are writting to the file `gsg.json` as an array of json objects.
+* The updated `gsg.json` file is checkin to this repo and the landing page is rebuilt (automtically by GitHub)
+* When the file `index.html` is loaded by a browser (for the landing page), it reads the file `gsg.json` and renders the documentation list table using javascript
+
+