Update README.md
Update README.md
Update README.md
Update README.md
Added copyright notice
Fixed fermion antisymmetrization operator

- Counted particles with the same momentum too for the sign change, so that the first anticommutation relation (of the antisymmetrization and annihilation operators) holds
Made whole section "Wave function" to a "Complements" paragraph
Fixed notation collision

- Since "\mathrm M_\pt" is already used for the reduced rest masses, used "N_\pt^{max}" instead for the maximum occupation numbers
Corrected notation
Merge branch 'master' of github.com:sebastien-fauvel/quantum-ethics into issue-8
Added further History paragraph