add test model yolofastest

[RudyFoo]

No description provided.

[codecov]

Codecov Report

Merging #868 (021afc3) into tengine-lite (041f6c1) will increase coverage by 0.01%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           tengine-lite     #868      +/-   ##
================================================
+ Coverage         45.11%   45.12%   +0.01%     
================================================
  Files               392      392              
  Lines             27074    27074              
================================================
+ Hits              12215    12218       +3     
+ Misses            14859    14856       -3     

Impacted Files	Coverage Δ
source/api/c_api.c	48.26% <0.00%> (+0.54%)	⬆️

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[BUG1989]

lgtm!