Add rscc script

[stephaniewankowicz]

Adding post analysis script to calculate RSCC for ligand or any residue based on residue ID and chain ID

Pull Request Checklist

• [X] Will your PR merge into the dev branch?
  Exceptions will be made for urgent bugfixes.
• [X] Have you forked from dev?
  If not, please rebase your PR onto the most recent dev tip.
• [X] Does your PR title succinctly describe the changes?
  Explain to a new user by completing the sentence: 'This PR will: ...'
• [X] Fill out the template below.

---

Description of the Change

Release Notes

---