Provide basic README

README.md

@@ -1 +1,28 @@
-# multipg2csv
+# multipg2csv
+
+multipg2csv allows you to run a single query against multiple postgresql instances
+simultaneously, collecting the results into a collection of csv files packaged
+in a zip archive.
+
+## Installation
+
+From source:
+
+    go install github.com/tardisx/multipg2csv@latest
+
+Binaries:
+
+... coming soon
+
+## Usage
+
+    multipg2csv -query 'SELECT * FROM pg_stats_all_indexes;' -output index_stats.zip postgresql://server1/db1 postgresql://server2/db2
+
+Or maybe leverage your shell:
+
+    multipg2csv -query 'SELECT * FROM pg_stats_all_indexes;' -output index_stats.zip postgresql://db{1..20}/somedb
+
+PostgreSQL connection URL's are described here: https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING
+
+Note that `multipg2csv` will use your .pgpass if available, and you should definitely use it,
+instead of supplying passwords on the command line.