Update getting-started.md

[dingye18]

Update the compiling arguments in c++ interface example.

[codecov-commenter]

Codecov Report

Merging #898 (9cf4207) into devel (c4b9c9e) will decrease coverage by 17.89%.
The diff coverage is n/a.

❗ Current head 9cf4207 differs from pull request most recent head c4c1944. Consider uploading reports for the commit c4c1944 to get more accurate results

@@             Coverage Diff             @@
##            devel     #898       +/-   ##
===========================================
- Coverage   82.17%   64.28%   -17.90%     
===========================================
  Files         118        5      -113     
  Lines        9994       14     -9980     
===========================================
- Hits         8213        9     -8204     
+ Misses       1781        5     -1776     

Impacted Files	Coverage Δ
source/lib/tests/test_simulation_region.cc
deepmd/utils/weight_avg.py
source/lib/tests/test_prod_force_grad_r.cc
source/lib/tests/test_prod_virial_grad_a.cc
source/lib/tests/test_fmt_nlist.cc
source/api_cc/tests/test_deeppolar.cc
source/lib/tests/test_coord.cc
deepmd/infer/deep_dipole.py
deepmd/loggers/loggers.py
deepmd/utils/network.py
... and 103 more

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