Update README.md

Merged Shinya Maeda requested to merge docs/sm/update_readme into master

What does this MR do?

This MR updates outdated README.md

Why was this MR needed?

Current README.md is outdated.

Are there points in the code the reviewer needs to double check?

Is this better?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?