[Iluvatar] Add readme for llama-13b

[tianyuzhou668]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.79%. Comparing base (297dbce) to head (bc38d35).
Report is 15 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9670      +/-   ##
===========================================
- Coverage    52.79%   52.79%   -0.01%     
===========================================
  Files          718      718              
  Lines       112241   112252      +11     
===========================================
+ Hits         59262    59263       +1     
- Misses       52979    52989      +10     

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[ZHUI]

LGTM