Leave myself more breadcrumbs

README.md

@@ -2,3 +2,20 @@
 
 Transforms [this](http://api.bls.gov/publicAPI/v2/timeseries/data/CUUSA210SA0)
 into [this](http://s3.amazonaws.com/meatballhat/cpi/current.csv) :tada:.
+
+## usage
+
+This is intended for use with Google Sheets via:
+
+```
+=IMPORTDATA("http://s3.amazonaws.com/meatballhat/cpi/current.csv")
+```
+
+## deployment
+
+A copy of this thing is deployed to Heroku with a Heroku Scheduler addon
+configured to run the following once daily:
+
+``` bash
+bundle exec ruby cpi_fetcher.rb | bundle exec ruby mini_s3put.rb
+```