Add an examples in the parent class of all the backends
Add method to lib.plugins to retrieve all the plugins as objects
Adjust lib.plugins.load_plugins to return the plugin objects rather than just their name
Add a new template filter that takes a list of URL and returns a string with html links of them
Adjust the ui.new_project() to forward to the template the plugins objects
Add logic to display the examples of sources for each backends

These examples are set directly in the plugins and here we are using them
to show the user what type of input is expected