Create a folder named like as your inventory, for example. 'test_inventory'.
Go to custom/inventory/test_inventory
You can copy & paste client and server from others inventory folders or download empty files at bottom.
Change the string for your inventory name
CHANGE_ME_FOR_MY_INVENTORY_NAME
All inventories must work, at the moment we do not use metadata systems, please consult the documentation of each resource to know which functions to use.