README: A quick example to get started

[Jieran-S]

This is one of the issue on README file.

Create a section on how to get started with the workflow. Give a quick example of executing the workflow using one dataset/method/metric so people can start by just copy and paste

Give documentation on each step. Make it user-friendly!

Work only on workflow_update branch.

[heylf]

Ready for review

[Jieran-S]

I've updated the consensus part of the workflow! Might be worth it to add that part into the README as well! :))