expand README and add codemeta.yaml

Author: willnorris

README.md

@@ -1,3 +1,16 @@
 # opensource.twitter.dev
 
-Home of opensource.twitter.dev
+This is the Twitter Open Source website at https://opensource.twitter.dev.
+
+This site is built with [hugo], using a custom built-in theme.  Follow the
+standard instructions on the hugo website to [install] and [run] hugo.  Just
+make sure to use hugo-extended, which has added support for Sass/SCSS
+stylesheets.
+
+There are also some python scripts that run periodically to [update some repo
+data].
+
+[hugo]: https://gohugo.io/
+[install]: https://gohugo.io/getting-started/installing/
+[run]: https://gohugo.io/getting-started/usage/
+[update some repo data]: ./.github/workflows/update-data.yml

codemeta.yaml

@@ -0,0 +1,12 @@
+---
+"@context": https://doi.org/10.5063/schema/codemeta-2.0
+"@type": SoftwareSourceCode
+license: https://spdx.org/licenses/Apache-2.0
+codeRepository: git+https://github.com/twitter/opensource-website.git
+issueTracker: https://github.com/twitter/opensource-website/issues
+name: opensource.twitter.dev
+developmentStatus: active
+author:
+- "@type": Organization
+  identifier: OSS
+  name: Twitter Open Source Programs Office