update readme

README.md

@@ -1,4 +1,31 @@
-TODO documentation :)
+# Ocelloids Data Steward CLI
+
+The Ocelloids Data Steward CLI fetches aggregated data in JSON format from the Ocelloids data steward agent and outputs it to `stdout`, allowing you to easily use it with other command-line tools like `jq`.
+
+```shell
+Ocelloids Data Steward Agent command line interface
+
+Usage:
+  steward [command]
+
+Available Commands:
+  fetch       Streams either assets or chains data to stdout
+  help        Help about any command
+
+Flags:
+  -k, --api-key string    Ocelloids API key
+      --config string     config file (default is $HOME/.stw.yaml)
+  -h, --help              help for steward
+  -u, --http-url string   HTTP API base URL (default "https://dev-api.ocelloids.net")
+
+Use "steward [command] --help" for more information about a command.
+```
+
+---
+
+NOTES
+
+to clean up :)
 
 ```
 jq --slurp . < assets.jsonl > assets.json