Update 19-login-captcha.md

Author: ivictbor

adminforth/documentation/docs/tutorial/07-Plugins/19-login-captcha.md

@@ -1,5 +1,7 @@
 # Login Captcha
 
+(this plugin experemental and not yet fully tested)
+
 This plugin provides a captcha for the login page to enhance security.
 
 ## Installation
@@ -42,4 +44,4 @@ plugins: [
 
 After setting up the plugin, your login page will include a captcha. Below is an example of how it will look:
 
-![Login Captcha Example](LoginCaptcha1.png)
+![Login Captcha Example](LoginCaptcha1.png)