Making API call for users(SPREE)

Hi All,

   Spree supports 7 API Calls:

=> Orders => LineItems => Shipments => InventoryUnits => Products => Countries => States

I want to make an API which can create users in Get Method and Respond me back when the user is signed in.

& The same when I post the user name and password it should signup and give me the API key through which I can access the data's .

Please Help me out in solving this problem. Anyone's help is Appreciated.

Thanks In Advance Santosh