Added CASPER information to sambah_read.md

[kecunning]

GitHub Issue: #NUM (replace NUM with GitHub issue number)

Description

Added CASPER to the list of service chain options for SAMBAH along with a link to the CASPER repo. Added info about limitation that prevents running CONCISE and CASPER together.

Local test steps

Just look at the sambah_readme.md to confirm the addition is clear.

Overview of integration done

PR Acceptance Checklist

• Unit tests added/updated and passing
• Integration testing completed
• CHANGELOG.md updated
• Documentation updated (if needed)
• Breaking changes documented (if any)

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📚 Documentation preview 📚: https://stitchee--339.org.readthedocs.build/en/339/

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.63%. Comparing base (efe9646) to head (de35612).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #339       +/-   ##
============================================
+ Coverage    29.36%   90.63%   +61.27%     
============================================
  Files            9        9               
  Lines          470      470               
============================================
+ Hits           138      426      +288     
+ Misses         332       44      -288     

Flag	Coverage Δ
integration	?
unittests	90.63% <ø> (?)

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