Add submodule "juxtalearn-cookie-authentication"

* Within "juxtalearn-clipit-client" WP plugin
* https://github.com/juxtalearn/juxtalearn-cookie-authentication/commit/a5da30d3
Bug #8, Added "save_post_to_clipit" and "get_post_properties" to ClipIt client

* Also, "create_update_tags()" method/function
* Big changes again..