Add text about draft version

[tetter27]

• Added statement that master supports draft-01
• Added note about draft-06 support with link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.86%. Comparing base (b4798ba) to head (7ef06b5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   69.93%   69.86%   -0.08%     
==========================================
  Files          37       37              
  Lines        1427     1427              
==========================================
- Hits          998      997       -1     
- Misses        429      430       +1     

Components	Coverage Δ
moqt-core	88.28% <ø> (-0.23%)	⬇️
moqt-server	62.62% <ø> (ø)