Initial CI

[zmoon]

• [x] pre-commit (findent and white space)
• [x] document pre-commit setup
• [x] CMake config for the schemes and data/params/config (not driver routines so far)
• [x] document how to build
• [x] address strict GFortran build errors
• [ ] address some of the warnings, maybe adjust some warnings to be errors
• [ ] run pre-commit and build in GHA CI
• [ ] incorporate changes from #10 and #11 after they are merged
• [ ] add at least one (unit) test (to be sure the setup is working)
• [ ] document how to run the tests
• [ ] put workflow push branch guards back

Resolves #12

[zmoon]

Although the CI is not currently running here, I can see it ran in my fork after I disabled the repo and push branch guards.