You wrote a list of steps the user will take to perform a task. You have created a

You created an algorithm

Explanation:

The question would be better answered if there are options. Since there is none, I'll answer on a general term.

One answer that fits the description in the question is an algorithm. When you write an algorithm, you have written a guide or a step to achieve/complete a task.

Take for instance, you wrote step by step on how to use a microwave or for a user to operate a computer or for whatever instruction it might be; what you have done is that you have written an algorithm.

This is then further divided into two;

The instructions could be in form of (1) a flowchart or (2) a pseudocode

Irrespective of (1) & (2), what you've created is an algorithm.