Adding special thanks notes :)

README.md

@@ -106,3 +106,10 @@ You have found an Issue or have an question / suggestion regarding the plugin, o
 ## Beyond this repo
 
 This plugin has been included in the Joomla Core ([joomla/joomla-cms#18301](https://github.com/joomla/joomla-cms/pull/18301)) and will be part of the upcomming 4.0 Release. Please note that the core the plugin has been renamed to plg_system_plg_system_httpheaders (extra `s`) and extended by the new com_csp component for to core distribution.
+
+## Special Thanks
+
+David Jardin - @snipersister - https://www.djumla.de/
+Yves Hoppe - @yvesh - https://compojoom.com/
+
+For giving me the inspiration for the plugin and their feedback on the actual implementation. Thanks :+: