Add minichem (#1) (#161)

[chengcli]

• add forcing in the hot jupiter inp and remove forcing in hot jupiter pgen

• add minichem dir

• add minichem f90

• update minichem.inp

• minichem demo

• add pscalars

• minichem.cpp working for 2d

• spherical case

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[codecov[bot]]

Codecov Report

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

Project coverage is 99.17%. Comparing base (2a8e73f) to head (ac92843).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #162 +/- ## ======================================= Coverage 99.17% 99.17% ======================================= Files 31 31 Lines 1574 1574 ======================================= Hits 1561 1561 Misses 13 13 ```

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