Display map in cakephp3 with leaflet js plugin

I develop a website on cakephp3. i want to display a map on my website with markers. i used googlemaphelper but i must pay a licence. i have tried to use leaflet and openstreetmap but it not works and this is not enough documentation on it. somebody can help me to get a good documentation to install leaflet or another plugin for mapping free in cakephp3. Thks.