How can I create simple addon ?

Hi,



I am working on cs cart , in which i have to create simple addon which will generate category list on each product page , means all the category list on each product page



I gone through these steps



1.created addon on htdocs\cscart\addons\new_addon and similarly install on admin panel



2. cerated the folder with same name

htdocs\cscart\skins\aquarelle_green\customer\addons\new_addon\hook\products



Now How can i proceed further



please help