add TaylorAD() in Utility and update README

[houpc]

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[codecov-commenter]

Codecov Report

Attention: 124 lines in your changes are missing coverage. Please review.

Comparison is base (afe3ac6) 54.93% compared to head (605ce58) 58.71%.
Report is 1 commits behind head on computgraph.

Files	Patch %	Lines
src/frontend/frontends.jl	0.00%	80 Missing ⚠️
src/utility.jl	15.38%	33 Missing ⚠️
src/computational_graph/io.jl	0.00%	5 Missing ⚠️
src/backend/compiler_python.jl	0.00%	4 Missing ⚠️
src/frontend/diagram_id.jl	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@               Coverage Diff               @@
##           computgraph     #178      +/-   ##
===============================================
+ Coverage        54.93%   58.71%   +3.78%     
===============================================
  Files               52       51       -1     
  Lines             5028     4680     -348     
===============================================
- Hits              2762     2748      -14     
+ Misses            2266     1932     -334     

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