Add the licence notice at the top of every file

[rlouf]

Closes #407

[codecov]

Codecov Report

Merging #408 (492463f) into main (ee207dd) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #408      +/-   ##
==========================================
+ Coverage   89.73%   89.86%   +0.12%     
==========================================
  Files          45       45              
  Lines        2134     2160      +26     
==========================================
+ Hits         1915     1941      +26     
  Misses        219      219              

Impacted Files	Coverage Δ
blackjax/adaptation/mass_matrix.py	100.00% <ø> (ø)
blackjax/adaptation/meads.py	100.00% <ø> (ø)
blackjax/adaptation/pathfinder_adaptation.py	100.00% <ø> (ø)
blackjax/adaptation/step_size.py	100.00% <ø> (ø)
blackjax/adaptation/window_adaptation.py	100.00% <ø> (ø)
blackjax/diagnostics.py	100.00% <ø> (ø)
blackjax/mcmc/diffusions.py	100.00% <ø> (ø)
blackjax/mcmc/elliptical_slice.py	95.00% <ø> (+0.08%)	⬆️
blackjax/mcmc/ghmc.py	100.00% <ø> (ø)
blackjax/mcmc/hmc.py	100.00% <ø> (ø)
... and 51 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.