update docs

Author: thisisaaronland

README.md

@@ -1,7 +1,12 @@
 # go-http-oauth2
 
-Work in progress.
+Go HTTP middleware package for using an OAuth2 service as a single-sign-on provider.
+
+## Important
+
+This is work in progress, including the documentation. In the meantime please have a look at the [Geotagging at SFO Museum, part 9 – Publishing Data](https://millsfield.sfomuseum.org/blog/2020/05/07/geotagging-publishing/) blog post for an example of how the package works.
 
 ## See also
 
 * https://tools.ietf.org/html/draft-ietf-oauth-security-topics-15
+* https://github.com/aaronland/go-http-cookie