To add new tool just put the file 'tool_name.php' with php code in 'tools' directory. Corresponding button will be automatically added to top menu. Tool will be accessed via 'https:///?tool=tool_name'
Warning! To use clipboard copy functionality in code you must serve this tools over https!
Notice: SwagIt taken from https://gist.github.com/connerbw/2c83cfa4a093fc1c1f9291189737cf25