add wordpress role with lots of bells and whistles

docs/wordpress.md

@@ -0,0 +1,21 @@
+# Required variables
+These variables are required. Example values included.
+
+```
+ports:
+  wordpress_http: 8080
+
+docker_vhost_domains:
+  wordpress:
+    - wordpress.domain.tld
+
+database_passwords:
+  wordpress: secret
+```
+
+# Optional variables
+These variables have default values listed below
+
+```
+wordpress_tag: php8.1
+```