Create readme.md

inc/captcha/readme.md

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+I integrated this from: https://github.com/ctrlcctrlv/infinity/commit/62a6dac022cb338f7b719d0c35a64ab3efc64658
+
+<strike>First import the captcha/dbschema.sql in your database</strike> it is no longer required.
+
+In inc/captcha/config.php change the database_name database_user database_password to your own settings.
+
+Add js/captcha.js in your instance-config.php or config.php 
+
+Go to Line 305 in the /inc/config file and copy the settings in instance config, while changing the url to your website.
+Go to the line beneath it if you only want to enable it when posting a new thread.