Added a function to calculate spectral form factor after following work cited here from another author (https://www.youtube.com/watch?v=sU-_3BTftrY) . This code has been modified and added to. It now contains technics for
--eigenvalues,
--eigenvectors,
--spectral form factor,
--growth rate
-- JT Gravity
--JT spectral form factor
--JT partition function
-- AdS2/CFT1
-- Quantum chaos
and so on