doc: Add SD-JWT Docs

[sandrask]

Add SD-JWT Docs

Closes #3532

[codecov]

Codecov Report

Merging #3542 (5869aa2) into main (8771727) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 5869aa2 differs from pull request most recent head dda051f. Consider uploading reports for the commit dda051f to get more accurate results

@@            Coverage Diff             @@
##             main    #3542      +/-   ##
==========================================
- Coverage   87.74%   87.73%   -0.02%     
==========================================
  Files         351      351              
  Lines       48571    48428     -143     
==========================================
- Hits        42617    42486     -131     
+ Misses       4410     4402       -8     
+ Partials     1544     1540       -4     

Impacted Files	Coverage Δ
pkg/doc/sdjwt/holder/holder.go	100.00% <ø> (ø)
pkg/doc/sdjwt/issuer/issuer.go	91.95% <ø> (ø)
pkg/doc/sdjwt/verifier/verifier.go	90.62% <ø> (ø)

... and 5 files with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.