add a tutorial example for SSH model ground state

[liwt31]

Thanks! Please update example/run.sh to make sure the file is tested during CI

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.17%. Comparing base (78516d8) to head (af576b5). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #173 +/- ## ========================================== - Coverage 86.18% 86.17% -0.02% ========================================== Files 118 118 Lines 12852 12852 ========================================== - Hits 11077 11075 -2 - Misses 1775 1777 +2 ```

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[liwt31]

Some of the tests failed but it's more like minor numerical errors. Thanks Jiang!