implemented page options: only registered, show mode, image.
addeded phpunit tests e e2e tests for options page
update readme file with Work inn progress
- create DB schema
- manage DB creation and updates with plugin
added function atyfp_link() now it has to be implemented
- update main wp_query to retrieve the data associated to each posts and make them available in post data as
    $post[favourites_counter] => 0
    $post[myfavourite] => 0
- implement rendering link add/remove favourite considering options plugin: image, counter