Add instructions for ssst and msmt fODFs

[karanphil]

Quick description

I added documentation for using ssst and msmt CSD.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.45%. Comparing base (9036777) to head (865adda).
⚠️ Report is 9 commits behind head on master.

❌ Your project status has failed because the head coverage (72.45%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1249      +/-   ##
==========================================
- Coverage   72.46%   72.45%   -0.02%     
==========================================
  Files         293      293              
  Lines       25185    25185              
  Branches     3527     3527              
==========================================
- Hits        18251    18248       -3     
  Misses       5445     5445              
- Partials     1489     1492       +3     

Components	Coverage Δ
Scripts	75.27% <ø> (-0.02%)	⬇️
Library	∅ <ø> (∅)

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[EmmaRenauld]

@karanphil Can you fix the conflict please? I'll merge after!