feat(rbw): add rbwpw function to copy passwords to the clipboard (#10639)

plugins/rbw/README.md

@@ -9,4 +9,14 @@ To use it, add `rbw` to the plugins array in your zshrc file:
 plugins=(... rbw)
 ```
 
+## `rbwpw`
+
+The `rbwpw` function is a wrapper around `rbw`. It copies the password in the
+clipboard for the service you ask for and clears the clipboard 20s later.
+The usage is as follows:
+
+```zsh
+rbwpw <service>
+```
+
 This plugin does not add any aliases.