Lookup plugin info and usage

README.md

@@ -1,2 +1,18 @@
 # ansible-modules-bitwarden
+
 Bitwarden integrations for Ansible
+
+## Lookup plugin
+
+Use `lookup()` with the `bitwarden` argument, followed by the items you want to retreive. The default field is `password`, but any other field can be specified. If you need to specify the path to the bitwarden CLI binary, use the `path` named argument. For example:
+
+```yaml
+# Get username for Slashdot and Google
+- debug: msg="{{ lookup('bitwarden', 'Slashdot', 'Google', field='username', path='/not/in/my/path/bw') }}"
+```
+
+If you want to run the plugin directly for testing, you must first specify the field, then list the items to fetch.
+
+```bash
+lib/ansible/plugins/lookup/bitwarden.py username Google Slashdot
+```