update README to show usage/help

README.md

@@ -16,6 +16,16 @@ this token is used for wpscan db api calls. To use the container:
 # BUILD IT
 docker build -t wp_checker .
 
+# HELP / USAGE
+
+docker run --env-file .env wp_checker --help
+Usage: check_wp_vuln.sh <options> <plugin/theme/wpversion>
+options:
+ --help                 display this help page
+ --plugin               query api for a specific plugin
+ --theme                query api for specific theme
+ --all                  retrieve all vulnerabilities in a specific wp version number
+
 # PLUGIN
 docker run --env-file .env wp_checker --plugin jetpack