Usage doc

README.md

@@ -13,11 +13,21 @@ pip install poetry
 poetry install
 ```
 
-# Run
-Thusly.
-
-Example:
-
+# Usage
 ```
-hsparse-csv-contacts --csv ~/all-contacts.csv
+$ hsparse-csv-contacts -h
+usage: hsparse-csv-contacts [-h] [-d] [-e] [-f] [-n] csv_file
+
+Parse Hubspot Contacts CSV Export
+
+positional arguments:
+  csv_file         Contacts CSV File
+
+options:
+  -h, --help       show this help message and exit
+  -d, --dump       Dump CSV contents
+  -e, --empty      List empty columns
+  -f, --fields     Fields from CSV header
+  -n, --non_empty  List number of non-empty values for each column
 ```
+