enable s3 upload

README.md

@@ -91,6 +91,16 @@ qc-cli infra destroy --yes                 Destroy stack without confirmation
 qc-cli infra destroy --delete-bucket-data  Destroy stack and delete S3 data
 ```
 
+### `upload`
+
+```
+qc-cli upload <file>                 Upload a single file to S3
+qc-cli upload <dir>                  Upload all files in a directory tree to S3
+qc-cli upload <file> --s3-key <key>  Upload a file to a custom S3 key
+```
+
+Uploads use `s3.bucket` and `s3.data_prefix` from `config.yaml`. File uploads default to `s3://<bucket>/<data_prefix>/<filename>`. Directory uploads are recursive, preserve paths relative to the uploaded directory, and place files under `s3://<bucket>/<data_prefix>/`.
+
 ## AWS permissions required
 
 The IAM user or role running the CLI needs: