Add basic documentation

[Ericgig]

Basic documentation structure.

• Installation information
• Example of auto-differentiation
• Re-active github actions

[Ericgig]

The failing test are fixed in #19

[coveralls]

Pull Request Test Coverage Report for Build 5519440856

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 12 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.02%) to 90.411%

---

Files with Coverage Reduction	New Missed Lines	%
src/qutip_jax/permute.py	2	87.5%
src/qutip_jax/qutip_trees.py	10	80.36%
<!--	Total:	12		-->

Totals
Change from base Build 5378410853:	0.02%
Covered Lines:	726
Relevant Lines:	803

---

💛 - Coveralls

[AGaliciaMartinez]

Thanks for applying the changes, I will do one more proof read and then we can merge.