How can I use OpenSpec in a large existing project，what is the first step I should do? #510
Description
I want to implement SDD in the existing large-scale project. But I'm quite confused about what I should do first in order to make the entire workflow run smoothly and continuously.
I noticed that compared to SpecKit, OpenSpec seems to be more user-friendly. However, I haven't found the best way to apply OpenSpec in the existing project. I would like to know if there are any relevant documents in this project that provide guidance on using OpenSpec to iterate requirements in existing projects?
Here is an example of a scenario I'm currently experiencing. The checkout module of the app is responsible for showing users various SKUs, various discount information, and completing payment transactions. All I have is a code library (the RAG build work for the project is underway). This is a ReactNative project that has been iterated over for many years. To be honest, I'm a bit unsure about how to use SDD to free myself from the task of writing code. More straightforwardly, I don't know what my first step should be, or rather, SDD is suitable for this type of project?