post https://app.asana.com/api/1.0/tasks
Creating a new task is as easy as POSTing to the /tasks endpoint with a
data block containing the fields you’d like to set on the task. Any
unspecified fields will take on default values.
Every task is required to be created in a specific workspace, and this
workspace cannot be changed once set. The workspace need not be set
explicitly if you specify projects or a parent task instead.