update readme for more public viewing and interaction

Author: gregsdennis

README.md

@@ -1,6 +1,23 @@
-Repo for blog content
+## Welcome
 
-- Main site (playground): https://json-everything.net
-- Blog: https://blog.json-everything.net
+This repository houses the source for `json-everything` blog site, https://blog.json-everything.net.
 
-For editing tips, see https://chirpy.cotes.page/.
+## Contributing
+
+We're happy to accept and review proposals for blog content.  Ideally, posts will cover:
+
+- updates to the libraries or project in general
+- how the libraries are being used
+- interesting things learned while working on or with the libraries
+
+The main project's [CODE OF CONDUCT](https://github.com/json-everything/json-everything/blob/master/CODE_OF_CONDUCT.md) also applies.
+
+## Running locally
+
+The site is a standard [Jekyll-based GitHub Pages site](https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll) using a modified [Chirpy theme](https://chirpy.cotes.page/).
+
+You'll need to install the dependencies listed in the GitHub docs to run it locally.  Once all of the dependencies are available, you can run the `run.bat` or `run.sh` scripts to more easily start up the site.
+
+## Style
+
+Please see the [Chirpy theme site](https://chirpy.cotes.page/) for examples of the markdown that's supported.